Bootstrap Cheatsheet

# Container Classes

container : add to <div> for fixed width container
container-fluid : add to <div> for full width container
container-sm|md|lg|xl : add to <div> for responive containers

Ex :

<div class="container"> ... </div>

# Jumbotron Classes

jumbotron : add to <div> for indicate big grey box for calling extra attention
jumbotron-fluid : add to <div> for full-width jumbotron without rounded borders

Ex :

<div class="jumbotron">
    <h1>Bootstrap Tutorial</h1>
    <p>Bootstrap is the most popular HTML, CSS...</p>
</div>

<div class="jumbotron jumbotron-fluid">
    <div class="container">
        <h1>Bootstrap Tutorial</h1>
        <p>Bootstrap is the most popular HTML, CSS...</p>
    </div>
</div>

# Heading Classes

display-1|2|3|4 : define header for element

Ex :

<h1 class="display-1">Display 1</h1>

# Typography Classes

Font Style :

font-weight-bold : bold text
font-weight-bolder : bolder text
font-italic : italic text
font-weight-light : light text
font-weight-lighter : lighter text
font-weight-normal : normal text

Ex :

<p class="font-weight-bold">Bold text</p>

Text Alignment :

text-left : left aligned text
text-sm|md|lg|xl-left : left-aligned text on screen size
text-right : right aligned text
text-sm|md|lg|xl-right : right aligned text on screens size
text-center : center aligned text
text-sm|md|lg|xl-center : center aligned text on screens size
text-justify : justified text

Ex :

<p class="text-right">Right-aligned text</p>

Text Format & Cases :

text-monospace : monospaced text
text-lowercase : lowercased text
text-uppercase : uppercased text
text-capitalize : capitalized text
text-break : prevents long text from breaking layout
text-nowrap : no wrap text
text-reset : resets color of text/link
text-decoration-none : removes underline from link

Ex :

<p class="text-uppercase">Uppercased text</p>

Lists Style :

list-unstyled : add to <ul>/<ol> to remove default list-style & ml on list items (this class only applies to immediate children list items)
list-inline : place all list items on single line (used together with .list-inline-item on each <li> elements)

Ex :

<ul class="list-unstyled">
    <li>Coffee</li>
    <li>Milk</li>
</ul>
<ul class="list-inline">
    <li class="list-inline-item">Coffee</li>
    <li class="list-inline-item">Tea</li>
</ul>

Text Format :

lead : makes paragraph stand out
small : small text than parent
initialism : display text inside <abbr> element in slightly smaller font size
pre-scrollable : make <pre> element scrollable

Ex :

<p class="lead">This paragraph stands out</p>
<p>The <abbr title="World Health Organization" class="initialism">WHO</abbr> was founded in 1948</p>
<pre class="pre-scrollable">
    Text in pre element is displayed in fixed-width font & it preservea both spaces & line breaks.
</pre>

Flex & Grid :

justify-content : justify content to start (default)
justify-content-start|end|center|between|around : justifies inside content to
align-content-start|end|center|between|around|stretch : align content to
align-items-start|end|center|baseline|stretch : align item to

# Float and Clearfix

float-left|right : float image to left or right
clearfix : clear floats

Ex :

<div class="clearfix">
    <span class="float-left">Float left</span>
    <span class="float-right">Float right</span>
</div>

Responive Floats Class :

float-sm|md|lg|xl-left|right : float depends on screen width

Ex :

<div class="float-sm-right">Float right on small screens or wider</div>

# Height and Width

w-% : set width to %
mw-% : set max-width to %
h-% : set height to %
mh-% : set max-height to %

Ex :

<div class="h-50 w-25 bg-warning">Width 25%, Height 50%</div>

# Margin and Padding

property-size : set margin/padding
property(side)-size : set specific sides margin/padding
property(side)-screen-size : set margin/padding according to screen width
property-auto : set margin/padding auto

Note :

property : m (margin) / p (padding)
side : l (left) / r (right) / t (top) / b (bottom) / x (left & right) / y (top & bottom)
size : 0, 1 (0.25rem), 2 (0.5rem), 3 (1rem), 4 (1.5rem), 5 (3rem); n1-n5 (sets negative value)
screen width : xs/sm/md/lg/xl

Ex :

<div class="pt-4 bg-warning">Padding 1.5rem</div>
<div class="m-5 pb-5 bg-info">Margin 3rem & Bottom Padding 3rem</div>
<div class="mb-sm-5 bg-warning">Margin Bottom 3rem on sm screens</div>
<div class="px-xl-5 bg-primary">Padding on x 5 on xl screens</div>

Center Align Element Using Margin :

Set left & right margin to auto i.e. mx-auto

<div class="mx-auto bg-warning" style="width:150px">Centered</div>

# Vertical Align

Only for inline elements.

align-baseline : align to line
align-top : align above line
align-middle : align to middle of line
align-bottom : align to bottom of line
align-text-top : align text to top of line
align-text-bottom : align text to bottom of line

Ex :

<span class="align-baseline">baseline</span>

# Visibility

visible : make element visible (visibility:visible)
invisible : make element invisible (visibility:hidden)

Ex :

<div class="visible">I am visible</div>

# Position

fixed-top|bottom : fixed to top or bottom
sticky-top : sticks to top on scroll

Ex :

Fixed nav-bar at top -

<nav class="navbar navbar-expand-sm bg-dark navbar-dark fixed-top">...</nav>

# Display Element

d-block : add to make element block level
d-sm|md|lg|xl-block : make block level depends on screen width
d-none : set display property none
d-sm|md|lg-none : make display none depends on srceen width
d-inline : make element inline
d-sm|md|lg|xl-inline : make element inline on specific screen width
d-inline-block : make element inline block
d-sm|md|lg|xl-inline-block : make element inline-block on specific screen size

Ex :

<span class="d-block bg-success">d-block</span>
<span class="d-sm-block bg-success">d-sm-block</span>

Display as Table :

d-table : add to <div> to make element display as table
d-sm|md|lg|xl-table : add to <div> make element display as table depends on screen size
d-table-cell : add to <div> inside table make element display as table cell
d-sm|md|lg|xl-table-cell : add to <div> to make element display as table cell depends on screen size
d-table-row : add to <div> inside cell to make element display as table row
d-sm|md|lg|xl-table-row : add to <div> to make element display as table row depends on screen size

Ex :

<div class="d-table" style="width:100%">
    <div class="d-table-row" style="width:100%">
        <div class="d-table-cell">
            <h4>Left Cell</h4>
            <p>Some text</p>
        </div>
        <div class="d-table-cell">
            <h4>Middle Cell</h4>
            <p>Some text</p>
        </div>
        <div class="d-table-cell">
            <h4>Right Cell</h4>
            <p>Some text</p>
        </div>
    </div>
</div>

Display as Flex :

d-flex : create flexbox container & transform direct children into flex items
d-md|sm|lg|xl-flex : create flexbox container depends on screen size
d-inline-flex : create inline flexbox container
d-sm|md|lg|xl-inline-flex : create inline flexbox container depends on screen size

Ex :

<div class="d-flex p-3 bg-secondary text-white">    
    <div class="p-2 bg-info">Flex item 1</div>
    <div class="p-2 bg-warning">Flex item 2</div>
    <div class="p-2 bg-primary">Flex item 3</div>
</div>

# Color Classes

Text Color Classes :

text-primary : blue
text-secondary : silver grey
text-success : green
text-info : cyan
text-warning : yellow
text-danger : red
text-dark : dark grey
text-light : light grey
text-body : black (default color)
text-white : white
text-muted : grey
text-class-opacity : text-dark-50 (50% opacity text)

Ex :

<p class="text-primary">This text is important</p>
<a href="#" class="text-success">Success link</a>
<p class="text-black-50">Black text with 50% opacity on white background</p>

Background Color Classes :

bg-primary : blue
bg-secondary : grey
bg-success : green
bg-info : cyan
bg-warning : yellow
bg-danger : red
bg-dark : dark grey
bg-light : light grey

Ex :

<p class="bg-primary text-white">This text is important</p>

# Screenreaders

sr-only : to hide element on all devices, except screen readers

Ex :

<span class="sr-only">I will be hidden on all screens except for screen readers.</span>

# Responsive Embeds

embed-responsive-aspectRatio : add to parent element of video/iframe (div/span)
embed-responsive-item : add to <video>/<iframe>

Ex :

Frame will be open is ratio 21:9 on screen -

<div class="embed-responsive embed-responsive-21by9">
    <iframe class="embed-responsive-item" src="..."></iframe>
</div>

# Border

border : add default border to element
border-0 : set border width to 0
border-top|bottom|left|right-0 : set specific border to 0

Ex :

<span class="border"></span>
<span class="border border-0"></span>
<span class="border border-top-0"></span>

Contextual Border Color Classes :

border-primary : blue
border-secondary : grey
border-success : green
border-info : cyan
birder-warning : yellow
border-danger : red
border-dark : dark grey
border-light : light grey
border-white : white

Ex :

<span class="border border-primary"></span>

Border Radius Classes :

rounded : rounded border
rounded-sm : rounded border on sm, lg & xl screens
rounded-lg : rounded border on lg and xl screens
rounded-left|right|top|bottom : border to specific side
rounded-circle : border of 50% radius
rounded-0 : no rounded border

Ex :

<span class="rounded-lg"></span>

# Shadow

shadow : add default shadow to element
shadow-none : no shadow
shadow-sm|lg : add shadow on sm & lg shadow

Ex :

<div class="shadow-none p-4 mb-4 bg-light">No shadow</div>
<div class="shadow-sm p-4 mb-4 bg-white">Small shadow</div>

# Tables Classes

table : add to <table> for basic table style

Ex :

<table class="table">
    <thead>
        <tr>
            <th>Name</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>John</td>
            <td>Doe</td>
        </tr>
    </tbody>
</table>

Table Style Classes :

table-striped : add zebra-stripes to rows
table-bordered : add borders on all sides of table and cells
table-hover : add hover effect (grey background color) on table rows
table-dark : add dark background to table
table-borderless : removes borders from table
table-sm : make table smaller by cutting cell padding in half

Add in <table>.

Ex :

<table class="table table-striped">
    <thead class="thead-dark">
        <tr>
            <th>header</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>text 1</td>
        </tr>
        <tr>
            <td>text 2</td>
        </tr>
    </tbody>
</table>

Responsive Table :

table-responsive : add scrollbar to table when needed
table-responsive-sm|md|lg|xl : add scrollbar to table when needed depends on screen width

Add in parent <div> element of table.

Ex :

<div class="table-responsive">
    <table class="table table-bordered"> ... </table>
</div>

Table Header Color :

thead-dark : add dark background to table header
thead-light : add grey background to table header

Add in table header <thead>.

Ex :

<table class="table table-striped table-sm">
    <thead class="thead-dark">
        <tr>
            <th>header</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>text 1</td>
        </tr>
        <tr>
            <td>text 2</td>
        </tr>
    </tbody>
</table>

Contextual Color Classes :

table-primary : blue
table-success : green
table-info : cyan
table-warning : yellow
table-danger : red
table-active : grey
table-secondary : grey
table-light : light grey
table-dark : dark grey

For row/col.

Ex :

<table class="table table-striped">
    <thead>
        <tr class="table-primary">
            <th>header</th>
        </tr>
    </thead>
    <tbody>
        <tr class="table-light text-dark">
            <td>text 1</td>
        </tr>
    </tbody>
</table>

# Image Classes

rounded : add rounded corners to image
rounded-circle : shape image to circle
img-thumbnail : shape image to thumbnail (bordered)
float-left : float image to left
float-right : float image to right
img-fluid : image scale to parent element

Ex :

<img src="cinqueterre.jpg" class="rounded" alt="Cinque Terre">
<img src="paris.jpg" class="float-left">

Float Image To Center (Center Aligned Image) -

<img src="paris.jpg" class="mx-auto d-block">

# Alert Box Classes

alert : default alert

Ex :

<div class="alert">
    <strong>Alert!</strong> This is alert-box
</div>

Contextual Alert Classes :

alert-success
alert-info
alert-warning
alert-danger
alert-primary
alert-secondary
alert-light
alert-dark

Ex :

<div class="alert alert-success">
    <strong>Success!</strong> Indicates a successful or positive action.
</div>

Alert Links Class :

alert-link : add to links <a> inside alert box to create matching colored links

Ex :

<div class="alert alert-success">
    <strong>Success!</strong> You should <a href="#" class="alert-link">read this message</a>.
</div>

Animated Alerts :

add .fade and .show class to alert box

Ex :

<div class="alert alert-success alert-dismissible fade show">
    <button type="button" class="close" data-dismiss="alert">&times;</button>
    <strong>Success!</strong> This alert box could indicate a successful or positive action.
</div>

Close Button Class :

alert-dismissible : add to create dismussible alert box

Ex :

<div class="alert alert-success alert-dismissible">
    <button type="button" class="close" data-dismiss="alert">&times;</button>
    <strong>Success!</strong> Indicates a successful or positive action.
</div>

# Button Classes

btn : add to <button>/<input>/<a> for basic button style

Ex :

<button type="button" class="btn">Basic</button>

Button Classes :

btn-block : make button block-level that spans full width
active : active button
disable : disabled button

Ex :

<button type="button" class="btn btn-primary btn-block">Full-Width Button</button>
<button type="button" class="btn btn-primary active">Active Primary</button>
<a href="#" class="btn btn-primary disabled">Disabled Link</a>

Contextual Button Colors :

btn-primary : blue
btn-secondary : grey
btn-success : green
btn-info : cyan
btn-warning : yellow
btn-danger : red
btn-light : light grey
btn-dark : dark grey
btn-link : no color

Ex :

<button type="button" class="btn btn-warning">Warning</button>

Button Outline Classes :

btn-outline-primary : blue
btn-outline-secondary : grey
btn-outline-success : green
btn-outline-info : cyan
btn-outline-warning : yellow
btn-outline-danger : red
btn-outline-light : light grey
btn-outline-dark : dark grey

Ex :

<button type="button" class="btn btn-outline-primary">Primary</button>

Spinner Buttons :

spinner-border : spinner button
spinner-border-sm : small size spinner button

Ex :

<button class="btn btn-primary">
    <span class="spinner-border spinner-border-sm"></span>
</button>

Button Size Classes :

btn-sm : small size button
btn-lg : large size button

Ex :

<button type="button" class="btn btn-primary btn-lg">Large</button>

Button Groups Classes :

btn-group : add to parent <div> of <button> for horizontal group buttons
btn-group-vertical : add to parent <div> of <button> for vertical group buttons

Ex :

<div class="btn-group">
    <button type="button" class="btn btn-primary">Apple</button>
    <button type="button" class="btn btn-primary">Samsung</button>
</div> 

<div class="btn-group-vertical">
    <button type="button" class="btn btn-primary">Apple</button>
    <button type="button" class="btn btn-primary">Samsung</button>
</div>

Button Group Sizing Classes :

btn-group-sm : small button
btn-group-lg : large button

Ex :

<div class="btn-group btn-group-lg">
    <button type="button" class="btn btn-primary">Apple</button>
    <button type="button" class="btn btn-primary">Sony</button>
</div>

Button Group With Dropdown List -

<div class="btn-group">
     <button type="button" class="btn btn-primary">Apple</button>
    <button type="button" class="btn btn-primary">Samsung</button>
    <div class="btn-group">
        <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">
            Sony
        </button>
        <div class="dropdown-menu">
            <a class="dropdown-item" href="#">Tablet</a>
            <a class="dropdown-item" href="#">Smartphone</a>
        </div>
    </div>
</div>

Split Button Dropdown :

dropdown-toggle-split : add to button for split

<div class="btn-group">
    <button type="button" class="btn btn-primary">Sony</button>
    <button type="button" class="btn btn-primary dropdown-toggle dropdown-toggle-split" data-toggle="dropdown">
        <span class="caret"></span>
    </button>
    <div class="dropdown-menu">
        <a class="dropdown-item" href="#">Tablet</a>
        <a class="dropdown-item" href="#">Smartphone</a>
    </div>
</div>

# Badges

badge : add badge to <span>

Ex :

<span class="badge">Badge</span>

Pill Badges :

badge-pill : to make badges more round

Ex :

<span class="badge badge-pill badge-primary">Primary</span>

Contextual Color Badges :

badge-primary : blue
badge-secondary : grey
badge-success : green
badge-info : cyan
badge-warning : yellow
badge-danger : red
badge-light : light grey
badge-dark : dark grey

Ex :

<span class="badge badge-primary">Primary</span>

# Progress Bar

progress : add progress to parent <div>
progress-bar : add progress-bar inside of parent progress for progress status

Ex :

<div class="progress">
    <div class="progress-bar" style="width:70%"> 70% </div>
</div>

Progress Bar Style Class :

progress-bar-striped : add stripes to progress bar
progress-bar-animated : for animating progress bar

Ex :

<div class="progress">
    <div class="progress-bar progress-bar-striped" style="width:40%"></div>
</div>

<div class="progress">
    <div class="progress-bar progress-bar-striped progress-bar-animated" style="width:40%"></div>
</div>

Multiple Progress Bar :

Use contextual color classes for bg & text color.

<div class="progress">
    <div class="progress-bar bg-success" style="width:40%">
        Free Space
    </div>
    <div class="progress-bar bg-warning" style="width:10%">
        Warning
    </div>
    <div class="progress-bar bg-danger" style="width:20%">
        Danger
    </div>
</div>

# Spinners

spinner-border : add to <div>/<span> for spinner of spinning border

Ex :

Use contextual color classes for color.

<div class="spinner-border text-primary"></div>

Growing Spinner :

spinner-grow : add to <div>/<span> for growing spinner

Ex :

<div class="spinner-grow text-muted"></div>

Spinner Size Classes :

spinner-border-sm|lg : spinner size
spinner-grow-sm|lg : spinner size

Ex :

<div class="spinner-border spinner-border-sm"></div>
<div class="spinner-grow spinner-grow-sm"></div>

# Pagination

pagination : add class to <ul>
page-item : add to each <li> inside <ul>
page-link : add to each link <a> inside of <li>

Page Status Class :

active : add to <li> for highlight current page
disabled : add to <li> for disable page click

Ex :

<ul class="pagination">
    <li class="page-item"><a class="page-link" href="#">Previous</a></li>
    <li class="page-item"><a class="page-link" href="#">1</a></li>
    <li class="page-item active"><a class="page-link" href="#">2</a></li>
    <li class="page-item disabled"><a class="page-link" href="#">3</a></li>
    <li class="page-item"><a class="page-link" href="#">Next</a></li>
</ul>

Pagination Size :

pagination-sm|lg : small & large pagination

Ex :

<ul class="pagination pagination-lg">
    <li class="page-item"><a class="page-link" href="#">Previous</a></li>
    <li class="page-item"><a class="page-link" href="#">1</a></li>
    <li class="page-item"><a class="page-link" href="#">2</a></li>
    <li class="page-item"><a class="page-link" href="#">Next</a></li>
</ul>

Pagination Alignment Classes :

justify-content-center : center aligned
justify-content-end : right aligned

Ex :

<ul class="pagination justify-content-end" style="margin:20px 0">
    <li class="page-item">...</li>
</ul>

Breadcrumbs :

Indicates current page's location within navigational hierarchy.

breadcrumb : add to <ul>
breadcrumb-item : add to each <li>

Ex :

<ul class="breadcrumb">
    <li class="breadcrumb-item"><a href="#">Photos</a></li>
    <li class="breadcrumb-item"><a href="#">Summer 2017</a></li>
    <li class="breadcrumb-item"><a href="#">Italy</a></li>
    <li class="breadcrumb-item active">Rome</li>
</ul>

# List Groups

list-group : add to <ul>
list-group-item : add to each <li>

List Page Status :

active : add to <li>/<a> for highlight current page
disabled : add to <li>/<a> for disable list

Ex :

<ul class="list-group">
    <li class="list-group-item">First item</li>
    <li class="list-group-item active">Second item</li>
    <li class="list-group-item">
        Inbox
        <span class="badge badge-primary badge-pill">12</span>
    </li>
</ul>

List Group With Linked Items :

list-group : add to <div>
list-group-items : add to each <a>

Ex :

<div class="list-group">
    <a href="#" class="list-group-item list-group-item-action">First item</a>
    <a href="#" class="list-group-item list-group-item-action">Second item</a>
    <a href="#" class="list-group-item disabled">Disabled item</a>
</div>

Horizontal List Groups :

list-group-horizontal : groups list horizontally

Ex :

<ul class="list-group list-group-horizontal">
    <li class="list-group-item">First item</li>
    <li class="list-group-item">Second item</li>
</ul>

List Group Style :

list-group-flush : add to <ul> to remove border & rounded corners
list-group-item-action : add to <li> to create grey bg on hover

Ex :

<ul class="list-group list-group-flush">
    <li class="list-group-item">First item</li>
    <li class="list-group-item list-group-item-action">Second item</li>
</ul>

Contextual List BG Colors :

list-group-item-action : white
list-group-item-success : green
list-group-item-secondary : grey
list-group-item-info : cyan
list-group-item-warning : yellow
list-group-item-danger : red
list-group-item-primary : blue
list-group-item-dark : dark grey
list-group-item-light : light grey

Ex :

<ul class="list-group">
    <li class="list-group-item list-group-item-success">Success item</li>
    <li class="list-group-item list-group-item-secondary">Secondary item</li>
</ul>

Link List with Contextual Colors -

<div class="list-group">
    <a href="#" class="list-group-item list-group-item-action list-group-item-dark">Action item</a>
    <a href="#" class="list-group-item list-group-item-action list-group-item-success">Success item</a>
</div>

# Cards

card : add to parent <div> for basic card

Card Classes :

card-header : add inside card for card header
card-body : add inside card for card body
card-footer : add inside card for card footer
card-title : add inside body for title
card-text : add add inside body for text
card-link : add add inside body for card link

Use contextual colors for bg & text colors.

Ex :

<div class="card">
    <div class="card-body">
        <h4 class="card-title">Card title</h4>
        <p class="card-text">Some example text. Some example text.</p>
        <a href="#" class="card-link">Card link</a>
        <a href="#" class="card-link">Another link</a>
    </div>
</div>

Card Images Classes :

card-img-top : add inside card for add image to top
card-img-bottom : add inside card for add image to bottom

Ex :

<div class="card" style="width:400px">
    <img class="card-img-top" src="img_avatar1.png" alt="Card image">
    <div class="card-body">
        <h4 class="card-title">John Doe</h4>
        <p class="card-text">Some example text</p>
        <a href="#" class="btn btn-primary">See Profile</a>
    </div>
</div>

Stretched Link :

stretched-link : add inside make whole card clickable & hoverable

Ex :

<div class="card" style="width:400px">
    <img class="card-img-top" src="img_avatar1.png" alt="Card image" style="width:100%">
    <div class="card-body">
        <h4 class="card-title">John Doe</h4>
        <p class="card-text">Some example text some example text. John Doe is an architect and engineer</p>
        <a href="#" class="btn btn-primary stretched-link">See Profile</a>
    </div>
</div>

Card Image Overlay :

card-img-overlay : add inside card for text on top of image

Ex :

<div class="card" style="width:500px">
    <img class="card-img-top" src="img_avatar1.png" alt="Card image">
    <div class="card-img-overlay">
        <h4 class="card-title">John Doe</h4>
        <p class="card-text">Some example text.</p>
        <a href="#" class="btn btn-primary">See Profile</a>
    </div>
</div>

Card Columns :

card-columns : add to parent <div> of card to create grid of cards (like pinterest)

Note : The layout will automatically adjust as you insert more cards. Cards are displayed vertically on small screens (<576px).

Ex :

<div class="card-columns">
    <div class="card bg-primary">
        <div class="card-body text-center">
            <p class="card-text">Some text inside the first card</p>
        </div>
    </div>
    <div class="card bg-warning">
        <div class="card-body text-center">
            <p class="card-text">Some text inside the second card</p>
        </div>
    </div>
    <div class="card bg-info">
        <div class="card-body text-center">
            <p class="card-text">Some text inside the sixth card</p>
        </div>
    </div>
</div>

Card Deck :

card-deck : add to parent <div> of card to create grid of cards are of equal height & width

Note : The layout will automatically adjust as you insert more cards. Cards are displayed vertically on small screens (<576px).

Ex :

<div class="card-deck">
    <div class="card bg-primary">
        <div class="card-body text-center">
            <p class="card-text">Some text inside the first card</p>
        </div>
    </div>
    <div class="card bg-warning">
        <div class="card-body text-center">
            <p class="card-text">Some text inside the second card</p>
        </div>
    </div>
    <div class="card bg-success">
        <div class="card-body text-center">
            <p class="card-text">Some text inside the third card</p>
        </div>
    </div>
</div>

Card Group :

card-group : add to parent <div> of card to create group of cards (same as card column & deck but it removes left & right margin)

Note : The layout will automatically adjust as you insert more cards. Cards are displayed vertically on small screens (<576px) with a top and bottom margin.

Ex :

<div class="card-group">
    <div class="card bg-primary">
        <div class="card-body text-center">
            <p class="card-text">Some text inside the first card</p>
        </div>
    </div>
    <div class="card bg-warning">
        <div class="card-body text-center">
            <p class="card-text">Some text inside the second card</p>
        </div>
    </div>
    <div class="card bg-success">
        <div class="card-body text-center">
            <p class="card-text">Some text inside the third card</p>
        </div>
    </div>
</div>

# Dropdown

dropdown : add to <div> element for dropdown menu
dropdown-menu : add to <div> inside dropdown for menu for dropdown
dropdown-item : add to each <div> for dropdown items

dropdown-toggle : add to <button>/<a> for dropdown toggle
data-toggle="dropdown" : add to <button>/<a> to made toggle as dropdown

Ex :

<div class="dropdown">
    <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">
        Dropdown button
    </button>
    <div class="dropdown-menu">
        <a class="dropdown-item" href="#">Link 1</a>
        <a class="dropdown-item" href="#">Link 2</a>
    </div>
</div>

Dropdown Item Status :

active : add to <a> of each menu for highlight active class
disabled : add to <a> of each menu for disable item

Ex :

<div class="dropdown">
        <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">
            Dropdown button
        </button>
        <div class="dropdown-menu">
            <a class="dropdown-item" href="#">Normal</a>
            <a class="dropdown-item active" href="#">Active</a>
            <a class="dropdown-item disabled" href="#">Disabled</a>
        </div>
</div>

Dropdown Divider :

dropdown-divider : add to <div> for dividing dropdown list & link with thin horiz border

Ex :

<div class="dropdown">
    <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">
        Dropdown button
    </button>
    <div class="dropdown-menu">
        <a class="dropdown-item" href="#">Link 1</a>
        <div class="dropdown-divider"></div>
        <a class="dropdown-item" href="#">Another link</a>
    </div>
</div>

Dropdown Header :

dropdown-header : add inside of dropdown menu for header

Ex :

<div class="dropdown">
    <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">
        Dropdown button
    </button>
    <div class="dropdown-menu">
        <h5 class="dropdown-header">Dropdown header</h5>
        <a class="dropdown-item" href="#">Link 1</a>
        <h5 class="dropdown-header">Dropdown header</h5>
        <a class="dropdown-item" href="#">Another link</a>
    </div>
</div>

Dropdown Position Class :

dropleft : add to dropdown class for left dropdown menu
dropright : add to dropdown class for right dropdown menu
dropup : add instead of dropdown for dropup menu
dropdown-menu-right : add to dropdown class for right-align dropdown menu

Ex :

<div class="dropdown dropright">
    <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">
        Dropright button
    </button>
    <div class="dropdown-menu">
        <a class="dropdown-item" href="#">Link 1</a>
        <a class="dropdown-item" href="#">Link 2</a>
    </div>
</div>

Dropup :

<div class="dropup">
    <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">
        Dropup button
    </button>
    <div class="dropdown-menu">
        <a class="dropdown-item" href="#">Link 1</a>
        <a class="dropdown-item" href="#">Link 2</a>
    </div>
</div>

Dropdown Text :

dropdown-item-text : add text with dropdown link

Ex :

<div class="dropdown">
    <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">
        Dropdown button
    </button>
    <div class="dropdown-menu">
        <a class="dropdown-item" href="#">Link 1</a>
        <a class="dropdown-item-text" href="#">Text Link</a>
        <span class="dropdown-item-text">Just Text</span>
    </div>
</div>

Grouped Buttons with Dropdown -

<div class="btn-group">
    <button type="button" class="btn btn-primary">Apple</button>
    <button type="button" class="btn btn-primary">Samsung</button>
    <div class="btn-group">
        <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">
             Sony
        </button>
        <div class="dropdown-menu">
            <a class="dropdown-item" href="#">Tablet</a>
            <a class="dropdown-item" href="#">Smartphone</a>
        </div>
    </div>
</div>

Split Button Dropdowns :

dropdown-toggle-split : add to button to split button & dropdown toggle

Ex :

<div class="btn-group">
    <button type="button" class="btn btn-primary">Primary</button>
    <button type="button" class="btn btn-primary dropdown-toggle dropdown-toggle-split" data-toggle="dropdown">
    </button>
    <div class="dropdown-menu">
        <a class="dropdown-item" href="#">Link 1</a>
        <a class="dropdown-item" href="#">Link 2</a>
    </div>
</div>

Vertical Button Group with Dropdown :

btn-group-vertical : add to parent <div> for vertical button group

Ex :

<div class="btn-group-vertical">
    <button type="button" class="btn btn-primary">Apple</button>
    <button type="button" class="btn btn-primary">Samsung</button>
    <div class="btn-group">
        <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">
            Sony
        </button>
        <div class="dropdown-menu">
            <a class="dropdown-item" href="#">Tablet</a>
            <a class="dropdown-item" href="#">Smartphone</a>
        </div>
    </div>
</div>

# Collapse

collapse : add to <div> to make collapsible element

data-toggle="collapse" : to control (show/hide) collapsible content add attribute to <button>/<a>
data-target="#id" : add attribute to connect button with collapsible content (<div id="demo">)
hide (default) : hide content
show : show content

Ex :

<button data-toggle="collapse" data-target="#demo">Collapsible</button>
<div id="demo" class="collapse">
    Text Here
</div>

Note : for <a> href attribute can be used instead of data-target attribute -

<a href="#demo" data-toggle="collapse">Collapsible</a>
<div id="demo" class="collapse">
    Text Here
</div>

Accordion (Collaspible Cards) :

<div id="accordion">
    <div class="card">
        <div class="card-header">
            <a class="card-link" data-toggle="collapse" href="#collapseOne">
                Collapsible Group Item #1
            </a>
        </div>
        <div id="collapseOne" class="collapse show" data-parent="#accordion">
            <div class="card-body">
                Lorem ipsum..
            </div>
        </div>
    </div>
    <div class="card">
        <div class="card-header">
            <a class="collapsed card-link" data-toggle="collapse" href="#collapseTwo">
                Collapsible Group Item #2
            </a>
        </div>
        <div id="collapseTwo" class="collapse" data-parent="#accordion">
            <div class="card-body">
                Lorem ipsum..
            </div>
        </div>
    </div>
</div>

# Navs

nav : add to <ul> to create horiz nav
nav-item : add to each <li> for nav items
nav-link : add to each link (<a>) of <li>

Ex :

<ul class="nav">
    <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
    </li>
    <li class="nav-item">
        <a class="nav-link disabled" href="#">Disabled</a>
    </li>
</ul>

Nav Alignment :

justify-content-center : add to <ul> for center aligned nav
justify-content-end : add to <ul> for right aligned nav

Ex :

<ul class="nav justify-content-center"> ... </ul>

Vertical Nav :

flex-column : add to <ul> for vertical nav

Ex :

<ul class="nav flex-column">

Nav Tabs :

nav-tabs : add to <ul> for turn nav menu into navigation tabs

Add .active class to indicate active tab.

Ex :

<ul class="nav nav-tabs">
    <li class="nav-item">
        <a class="nav-link active" href="#">Active</a>
    </li>
    <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
    </li>
    <li class="nav-item">
        <a class="nav-link disabled" href="#">Disabled</a>
    </li>
</ul>

Nav Pills :

nav-pills : add to <ul> for turn nav menu into navigation pills

Add .active class to indicate active tab.

Ex :

<ul class="nav nav-pills">
    <li class="nav-item">
        <a class="nav-link active" href="#">Active</a>
    </li>
    <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
    </li>
    <li class="nav-item">
        <a class="nav-link disabled" href="#">Disabled</a>
    </li>
</ul>

Justified Tabs/Pills :

Tabs or pills of equal width.

nav-justified : add to <ul> for nav-tabs/pills of equal width tabs

Ex :

<ul class="nav nav-pills nav-justified"> ... </ul>
<ul class="nav nav-tabs nav-justified"> ... </ul>

Pills with Dropdown -

<ul class="nav nav-pills">
    <li class="nav-item">
        <a class="nav-link active" href="#">Active</a>
    </li>
    <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#">Dropdown</a>
        <div class="dropdown-menu">
            <a class="dropdown-item" href="#">Link 1</a>
            <a class="dropdown-item" href="#">Link 2</a>
        </div>
    </li>
    <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
    </li>
</ul>

Tabs with Dropdown -

<ul class="nav nav-tabs">
    <li class="nav-item">
        <a class="nav-link active" href="#">Active</a>
    </li>
    <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#">Dropdown</a>
        <div class="dropdown-menu">
            <a class="dropdown-item" href="#">Link 1</a>
            <a class="dropdown-item" href="#">Link 2</a>
        </div>
    </li>
    <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
    </li>
</ul>

Toggleable / Dynamic Tabs -

<!-- Nav Tabs -->
<ul class="nav nav-tabs">
    <li class="nav-item">
        <a class="nav-link active" data-toggle="tab" href="#home">Home</a>
    </li>
    <li class="nav-item">
        <a class="nav-link" data-toggle="tab" href="#menu">Menu</a>
    </li>
</ul>
<!-- Tab Panes Content -->
<div class="tab-content">
    <div class="tab-pane container active" id="home">...</div>
    <div class="tab-pane container fade" id="menu">...</div>
</div>

Toggleable / Dynamic Pills :

<!-- Nav Pills -->
<ul class="nav nav-pills">
    <li class="nav-item">
        <a class="nav-link active" data-toggle="pill" href="#home">Home</a>
    </li>
    <li class="nav-item">
        <a class="nav-link" data-toggle="pill" href="#menu">Menu</a>
    </li>
</ul>
<!-- Tab Panes Content -->
<div class="tab-content">
    <div class="tab-pane container active" id="home">...</div>
    <div class="tab-pane container fade" id="menu">...</div>
</div>

# Navbar

navbar : add to <nav> to create navbar
navbar-expand-sm|md|lg|xl : responsive expandable bar, stacks vertically on sm screens
navbar-nav : add to <ul> for navbar menu
nav-items : add to each <li> for nav items
nav-links : add to link (<a>) inside <li>
navbar-dark : add to <nav> for white text navbar
navbar-light : add to <nav> for dark text navbar

active|disabled : add to link (<a>) for disable|active nav-item

Use contextual color class for colored navbar.

Ex :

<nav class="navbar navbar-expand-sm navbar-dark bg-light">
    <ul class="navbar-nav">
        <li class="nav-item">
            <a class="nav-link" href="#">Link 1</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link 2</a>
        </li>
    </ul>
</nav>

Navbar Brand/Logo :

navbar-brand : add to <a>/<span> for navigation brand/logo and place inside <nav> on top

Ex :

<nav class="navbar navbar-expand-sm bg-dark">
    <a class="navbar-brand" href="#">Logo</a>
    ...
</nav>

Navbar Text :

navbar-text : add inside <nav> for text to navbar

Ex :

<nav class="navbar navbar-expand-sm bg-dark navbar-dark">
    <ul class="navbar-nav">
        <li class="nav-item">
            <a class="nav-link" href="#">Link 1</a>
        </li>
    </ul>
    <span class="navbar-text">
        Navbar text
    </span>
</nav>

Vertical Navbar :

remove navbar-expand-sm|md|lg|xl to create vertical navbar

Ex :

<nav class="navbar bg-light">
    <ul class="navbar-nav">
        <li class="nav-item">
            <a class="nav-link" href="#">Link 1</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Link 2</a>
        </li>
    </ul>
</nav>

Center Navbar :

justify-content-center : add to <nav> for center aligned navbar

Ex :

<nav class="navbar navbar-expand-sm bg-light justify-content-center"> ... </nav>

Collapsing Navigation Bar :

navbar-toggler : add to <button> to create collapsible navbar
navbar-toggler-icon : add in <span> inside button for collapse icon
collapse : add to parent <div> of <ul>
navbar-collapse : add to parent <div> of <ul>

add data-toggle="collapse" to <button> for collapsing navbar
add data-target="#thetarget" to <button> for selecting nav menu
remove .navbar-expand-md class to always hide nav-menu items

Ex :

<nav class="navbar navbar-expand-md bg-dark navbar-dark">
    <a class="navbar-brand" href="#">Navbar</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#collapsibleNavbar">
        <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="collapsibleNavbar">
        <ul class="navbar-nav">
            <li class="nav-item">
                <a class="nav-link" href="#">Link</a>
            </li>
        </ul>
    </div>
</nav>

Fixed Navigation Bar :

fixed-top : add to <nav> for navigation bar fixed at top
fixed-bottom : add to <nav> for navigation bar fixed at bottom
sticky-top : add to <nav> for navigation bar to stay top while scroll

Ex :

<nav class="navbar navbar-expand-sm bg-dark navbar-dark fixed-top">
    ...
</nav>

Navbar With Dropdown -

<nav class="navbar navbar-expand-sm bg-dark navbar-dark">
    <a class="navbar-brand" href="#">Logo</a>
    <ul class="navbar-nav">
        <li class="nav-item">
            <a class="nav-link" href="#">Link 1</a>
        </li>
        <li class="nav-item dropdown">
            <a class="nav-link dropdown-toggle" href="#" id="navbardrop" data-toggle="dropdown">
                Dropdown link
            </a>
            <div class="dropdown-menu">
                <a class="dropdown-item" href="#">Link 1</a>
                <a class="dropdown-item" href="#">Link 2</a>
            </div>
        </li>
    </ul>
</nav>

Navbar With Forms & Buttons -

<nav class="navbar navbar-expand-sm bg-dark navbar-dark">
    <form class="form-inline" action="/action_page.php">
        <input class="form-control mr-sm-2" type="text" placeholder="Search">
        <button class="btn btn-success" type="submit">Search</button>
    </form>
</nav>

# Carousel

Slideshow sliding through elements.

carousel : add to <div> for creating carousel of image
slide : add with corousel for make slide of images
carousel-indicators : add to <ul> inside <div> for indicators for carousel (little dots at bottom of each slide)
carousel-inner : add to <div> to define slides to carousel
carousel-item : add to <div> for content of each slide
carousel-control-prev : add to <a> for left (previous) button to carousel
carousel-control-next : add to <a> for right (next) button to carousel
carousel-control-prev-icon : used together with .carousel-control-prev to create "previous" button
carousel-control-next-icon : used together with .carousel-control-next to create "next" button
slide : add to CSS transition & animation effect when sliding from one item to next

Note :

Add data-ride="carousel" in .carousel class.
Add data-slide-to="0" no to each <li> item.

Ex :

<div id="demo" class="carousel slide" data-ride="carousel">
    <!-- Indicators -->
    <ul class="carousel-indicators">
        <li data-target="#demo" data-slide-to="0" class="active"></li>
        <li data-target="#demo" data-slide-to="1"></li>
        <li data-target="#demo" data-slide-to="2"></li>
    </ul>
    <!-- The slideshow -->
    <div class="carousel-inner">
        <div class="carousel-item active">
            <img src="la.jpg" alt="Los Angeles">
        </div>
        <div class="carousel-item">
            <img src="chicago.jpg" alt="Chicago">
        </div>
        <div class="carousel-item">
            <img src="ny.jpg" alt="New York">
        </div>
    </div>
    <!-- Left and right controls -->
    <a class="carousel-control-prev" href="#demo" data-slide="prev">
        <span class="carousel-control-prev-icon"></span>
    </a>
    <a class="carousel-control-next" href="#demo" data-slide="next">
        <span class="carousel-control-next-icon"></span>
    </a>
</div>

Add Caption :

carousel-caption : add within each <div class="carousel-item"> to create caption for each slide

Ex :

<div id="demo" class="carousel slide" data-ride="carousel">
    <ul class="carousel-indicators">
        <li data-target="#demo" data-slide-to="0" class="active"></li>
    </ul>
    <div class="carousel-inner">
        <div class="carousel-item active">
            <img src="la.jpg" alt="Los Angeles" width="1100" height="500">
            <div class="carousel-caption">
                <h3>Los Angeles</h3>
                <p>We had such a great time in LA!</p>
            </div>
        </div>
    </div>
    <a class="carousel-control-prev" href="#demo" data-slide="prev">
        <span class="carousel-control-prev-icon"></span>
    </a>
    <a class="carousel-control-next" href="#demo" data-slide="next">
        <span class="carousel-control-next-icon"></span>
    </a>
</div>

# Modal

modal : add to <div> to create modal
modal-dialog : add to <div> inside .modal for modal elements
modal-content : add to <div> inside .modal-dialog for modal content
modal-header : add to <div> inside .modal-content for modal header
modal-title : add to <div>/<h> inside .modal-header for header title
modal-body : add to <div> inside .modal-content for modal body
modal-footer : add to <div> inside .modal-content for modal footer

Note :

for opening modal add <button> & add data-toggle="modal" & target="#id" to <button>.
for close button add <button> inside header or footer & add data-dismiss="modal" to <button>.

Ex :

<!-- Button to Open the Modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#myModal">
    Open modal
</button>
<!-- The Modal -->
<div class="modal" id="myModal">
    <div class="modal-dialog">
        <div class="modal-content">
            <!-- Modal Header -->
            <div class="modal-header">
                <h4 class="modal-title">Modal Heading</h4>
                <button type="button" class="close" data-dismiss="modal">&times;</button>
            </div>
            <!-- Modal body -->
            <div class="modal-body">
                Modal body..
            </div>
            <!-- Modal footer -->
            <div class="modal-footer">
                <button type="button" class="btn btn-danger" data-dismiss="modal">Close</button>
            </div>
        </div>
    </div>
</div>

Add Open/Close Animation :

fade : add with .modal class for open/close fading animation

Ex :

<div class="modal fade"> ... </div>

Modal Size :

modal-sm|lg|xl (default md) : add with .modal-dialog class for sizing modal

Ex :

<div class="modal-dialog modal-sm"> ... </div>

Centered Modal :

modal-dialog-centered : add with .modal-dialog for center modal vertically & horizontally within page

Ex :

<div class="modal-dialog modal-dialog-centered"> ... </div>

Scrolling Modal :

modal-dialog-scrollable : add with .modal-dialog to only scroll inside modal body instead of page itself

Ex :

<div class="modal-dialog modal-dialog-scrollable"> ... </div>

# Tooltip

data-toggle="tooltip" : add attribute to element to create tooltip
title="Hover Text" : add attribute to element for hover text
data-placement="top|bottom|left|right" : add attribute to element for placement of tooltip

Ex :

<a href="#" data-toggle="tooltip" title="Hooray!">Hover over me</a>

<a href="#" data-toggle="tooltip" data-placement="top" title="Hooray!">Hover</a>

Note : Tooltips must be initialised with jQuery; select the specified element & call the tooltip() method. The following code will enable all tooltips in the document -

<script>
$(document).ready(function(){
    $('[data-toggle="tooltip"]').tooltip();
});
</script>

# Popover

data-toggle="popover" : add attribute to element to create popover
title="text" : add attribute to element for popover header text
data-content="content text" : add attribute to element for popover body text
data-placement="top|bottom|left|right" : add attribute to element for placement of popover
data-trigger="focus" : add attribute to element to close popover when clicking outside element
data-trigger="hover" : add attribute to element for popover to be display when mouse-over element

Ex :

<a href="#" data-toggle="popover" title="Popover Header" data-content="Some content inside popover">Toggle popover</a>

<a href="#" data-toggle="popover" title="Header" data-placement="top" data-content="Content">Click</a>

<a href="#" title="Dismissible popover" data-toggle="popover" data-trigger="focus" data-content="Click anywhere in document to close this popover">Click</a>

<a href="#" title="Dismissible Popover" data-toggle="popover" data-trigger="hover" data-content="Click anywhere in document to close this popover">Click</a>

Note : Popovers must be initialised with jQuery, select the specified element and call the popover() method. The following code will enable all popovers in this document -

<script>
$(document).ready(function(){
    $('[data-toggle="popover"]').popover();
});
</script>

# Toast

toast : add to element (<div>) to create toast
toast-header : add to element (<div>) inside .toast for toast header
toast-body : add to element (<div>) inside .toast for toast body
data-autohide="false" : add attribute with .toast for toasts to show by default (default hidden)
data-dismiss="toast" : add attribute to <button> to close toast

Ex :

<div class="toast">
    <div class="toast-header">
        Toast Header
    </div>
    <div class="toast-body">
        Some text inside the toast body
    </div>
</div>

<div class="toast" data-autohide="false">
    <div class="toast-header">
        <strong class="mr-auto text-primary">Toast Header</strong>
        <small class="text-muted">5 mins ago</small>
        <button type="button" class="ml-2 mb-1 close" data-dismiss="toast">&times;</button>
    </div>
    <div class="toast-body">
        Some text inside the toast body
    </div>
</div>

Note : Toasts must be initialised with jQuery; select the specified element & call the toast() method. The following code will show all "toasts" in the document -

<script>
$(document).ready(function(){
    $('.toast').toast('show');
});
</script>

# Scrollspy

data-spy="scroll" : add attribute to scrollable element Ex. <body>
data-target="#id|.class" : add attribute to target navigation bar and set class/id
data-offset="value" : set number of pixels to offset from top when calculating position of scroll (optional)

Note : Scrollable element must match id/class of links inside navbar's list items (<div id="section1"> matches <a href="#section1">).

Ex :

<body data-spy="scroll" data-target=".navbar" data-offset="50">
<nav class="navbar navbar-expand-sm bg-dark navbar-dark fixed-top">  
    <ul class="navbar-nav">
        <li class="nav-item">
            <a class="nav-link" href="#section1">Section 1</a>
        </li>
        <li class="nav-item dropdown">
            <a class="nav-link dropdown-toggle" href="#" id="navbardrop" data-toggle="dropdown">Section 2</a>
            <div class="dropdown-menu">
                <a class="dropdown-item" href="#section21">Link 1</a>
                <a class="dropdown-item" href="#section22">Link 2</a>
            </div>
        </li>
    </ul>
</nav>
<div id="section1" class="container-fluid bg-success" style="padding-top:70px;padding-bottom:70px">
    <h1>Section 1</h1>
    <p>Try to scroll this section and look at navigation bar while scrolling!</p>
    <p>Try to scroll this section and look at navigation bar while scrolling!</p>
</div>
<div id="section21" class="container-fluid bg-danger" style="padding-top:70px;padding-bottom:70px">
    <h1>Section 2 Submenu 1</h1>
    <p>Try to scroll this section and look at navigation bar while scrolling!</p>
    <p>Try to scroll this section and look at navigation bar while scrolling!</p>
</div>
<div id="section22" class="container-fluid bg-info" style="padding-top:70px;padding-bottom:70px">
    <h1>Section 2 Submenu 2</h1>
    <p>Try to scroll this section and look at navigation bar while scrolling!</p>
    <p>Try to scroll this section and look at navigation bar while scrolling!</p>
</div>
</body>

Vertical Navigation Bar -

<body data-spy="scroll" data-target="#myScrollspy" data-offset="1">
<div class="container-fluid">
    <div class="row">
        <nav class="col-sm-3 col-4" id="myScrollspy">
            <ul class="nav nav-pills flex-column">
                <li class="nav-item">
                    <a class="nav-link active" href="#section1">Section 1</a>
                </li>
                <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#">Section 2</a>
                    <div class="dropdown-menu">
                        <a class="dropdown-item" href="#section21">Link 1</a>
                        <a class="dropdown-item" href="#section22">Link 2</a>
                    </div>
                </li>
            </ul>
        </nav>
        <div class="col-sm-9 col-8">
            <div id="section1" class="bg-success">    
                <h1>Section 1</h1>
                <p>Try to scroll this section and look at navigation list while scrolling!</p>
            </div>
            <div id="section21" class="bg-danger">         
                <h1>Section 2-1</h1>
                <p>Try to scroll this section and look at navigation list while scrolling!</p>
            </div>    
            <div id="section22" class="bg-info">         
                <h1>Section 2-2</h1>
                <p>Try to scroll this section and look at navigation list while scrolling!</p>
            </div>
        </div>
    </div>
</div>
</body>

# Media Objects

media : add to <div> element for creating media & must be add inside container
media-body : add to <div> inside .media for adding content

Ex :

<div class="media border p-3">
    <img src="img_avatar3.png" alt="John Doe" class="mr-3 mt-3 rounded-circle" style="width:60px;">
    <div class="media-body">
        <h4>John Doe <small><i>Posted on February 19, 2016</i></small></h4>
        <p>Lorem ipsum...</p>
    </div>
</div>

Nested Media Objects :

<div class="media border p-3">
    <img src="img_avatar3.png" alt="John Doe" class="mr-3 mt-3 rounded-circle" style="width:60px;">
    <div class="media-body">
        <h4>John Doe <small><i>Posted on February 19, 2016</i></small></h4>
        <p>Lorem ipsum...</p>
        <div class="media p-3">
            <img src="img_avatar2.png" alt="Jane Doe" class="mr-3 mt-3 rounded-circle" style="width:45px;">
            <div class="media-body">
                <h4>Jane Doe <small><i>Posted on February 20 2016</i></small></h4>
                <p>Lorem ipsum...</p>
            </div>
        </div> 
    </div>
</div>

Right-Aligned Media Image :

<div class="media border p-3">
    <div class="media-body">
        <h4>John Doe <small><i>Posted on February 19, 2016</i></small></h4>
        <p>Lorem ipsum...</p>
    </div>
    <img src="img_avatar3.png" alt="John Doe" class="ml-3 mt-3 rounded-circle" style="width:60px;">
</div>

Top, Middle or Bottom Alignment :

Media Top -

<div class="media">
    <img src="img_avatar1.png" class="align-self-start mr-3" style="width:60px">
    <div class="media-body">
        <h4>Media Top</h4>
        <p>Lorem ipsum...</p>
    </div>
</div>

Media Middle -

<div class="media">
    <img src="img_avatar1.png" class="align-self-center mr-3" style="width:60px">
    <div class="media-body">
        <h4>Media Middle</h4>
        <p>Lorem ipsum...</p>
    </div>
</div>

Media Bottom -

<div class="media">
    <img src="img_avatar1.png" class="align-self-end mr-3" style="width:60px">
    <div class="media-body">
        <h4>Media Bottom</h4>
        <p>Lorem ipsum...</p>
    </div>
</div>

# Forms

form-group : add wrapper <div> with this class to each form's element for full width stacked form

Ex :

<form action="/action_page.php">
    <div class="form-group">
        <label for="email">Email address:</label>
        <input type="email" class="form-control" placeholder="Enter email" id="email">
    </div>
    <div class="form-group">
        <label for="pwd">Password:</label>
        <input type="password" class="form-control" placeholder="Enter password" id="pwd">
    </div>
    <div class="form-group form-check">
        <label class="form-check-label">
            <input class="form-check-input" type="checkbox"> Remember me
        </label>
    </div>
    <button type="submit" class="btn btn-primary">Submit</button>
</form>

Inline Form :

form-inline : add to <form> for inline forms

Ex :

<form class="form-inline" action="/action_page.php"> ... </form>

Form Row/Column :

row|form-row : add to wrapper <div> to create row form element
col : to add <div> inside .row to create col for each element

Ex :

<form>
    <div class="form-row">
        <div class="col">
            <input type="text" class="form-control" id="email" placeholder="Enter email" name="email">
        </div>
        <div class="col">
            <input type="password" class="form-control" placeholder="Enter password" name="pswd">
        </div>
    </div>
</form>

Form Validation :

was-validated : add to <form> for validate before submision
needs-validation : add to <form> for validate after submision

valid-feedback : add to seperate <div> with message for feedback if form is valid
invalid-feedback : add to seperate <div> with message for feedback if form is invalid

Validate Before Submission -

<form action="/action_page.php" class="was-validated">
    <div class="form-group">
        <label for="uname">Username:</label>
        <input type="text" class="form-control" id="uname" placeholder="Enter username" name="uname" required>
        <div class="valid-feedback">Valid.</div>
        <div class="invalid-feedback">Please fill out this field.</div>
    </div>
    <div class="form-group">
        <label for="pwd">Password:</label>
        <input type="password" class="form-control" id="pwd" placeholder="Enter password" name="pswd" required>
        <div class="valid-feedback">Valid.</div>
        <div class="invalid-feedback">Please fill out this field.</div>
    </div>
    <div class="form-group form-check">
        <label class="form-check-label">
            <input class="form-check-input" type="checkbox" name="remember" required> I agree on blabla.
            <div class="valid-feedback">Valid.</div>
            <div class="invalid-feedback">Check this checkbox to continue.</div>
        </label>
    </div>
    <button type="submit" class="btn btn-primary">Submit</button>
</form>

Validate After Submission -

<form action="/action_page.php" class="needs-validation" novalidate>
    <div class="form-group">
        <label for="uname">Username:</label>
        <input type="text" class="form-control" id="uname" placeholder="Enter username" name="uname" required>
        <div class="valid-feedback">Valid.</div>
        <div class="invalid-feedback">Please fill out this field.</div>
    </div>
    <div class="form-group">
        <label for="pwd">Password:</label>
        <input type="password" class="form-control" id="pwd" placeholder="Enter password" name="pswd" required>
        <div class="valid-feedback">Valid.</div>
        <div class="invalid-feedback">Please fill out this field.</div>
    </div>
    <div class="form-group form-check">
        <label class="form-check-label">
            <input class="form-check-input" type="checkbox" name="remember" required> I agree on blabla.
            <div class="valid-feedback">Valid.</div>
            <div class="invalid-feedback">Check this checkbox to continue.</div>
        </label>
    </div>
    <button type="submit" class="btn btn-primary">Submit</button>
</form>
<script>
// Disable form submissions if there are invalid fields -
(function() {
    'use strict';
    window.addEventListener('load', function() {
        // Get the forms we want to add validation styles to -
        var forms = document.getElementsByClassName('needs-validation');
        // Loop over them and prevent submission -
        var validation = Array.prototype.filter.call(forms, function(form) {
            form.addEventListener('submit', function(event) {
                if (form.checkValidity() === false) {
                    event.preventDefault();
                    event.stopPropagation();
                }
                form.classList.add('was-validated');
            }, false);
        });
    }, false);
})();
</script>

# Form Inputs

form-control : add to <input> to style inputs with full-width & proper padding

Form Control Sizing :

form-control-sm|lg : add to <input> for input on specific screen size

Ex :

<input type="text" class="form-control form-control-sm">
<input type="text" class="form-control form-control">
<input type="text" class="form-control form-control-lg">

Form Control Types :

Form Control with Plain text -

form-control-plaintext : add to <input> for plain text form without border

<input type="text" class="form-control-plaintext">

Form Control File -

form-control-file : for input type file

<input type="file" class="form-control-file border">

Form Control Range -

form-control-range : for input type range

<input type="range" class="form-control-range">

Inputs Types :

Text/Password -

form-control : add to <input>

<div class="form-group">
  <label for="usr">Name:</label>
  <input type="text" class="form-control" id="usr">
</div>
<div class="form-group">
  <label for="pwd">Password:</label>
  <input type="password" class="form-control" id="pwd">
</div>

Textarea -

form-control : add to <textarea>

<div class="form-group">
  <label for="comment">Comment:</label>
  <textarea class="form-control" rows="5" id="comment"></textarea>
</div>

Checkboxes -

form-check : add to wrapper <div> to create checkbox
form-check-label : add to <label> to set label of checkbox
form-check-input : add to <input> type checkbox for checkbox selection
disabled : add to <input> to disable check item

<div class="form-check">
  <label class="form-check-label">
      <input type="checkbox" class="form-check-input" value="">Option 1
  </label>
</div>
<div class="form-check">
  <label class="form-check-label">
      <input type="checkbox" class="form-check-input" value="">Option 2
  </label>
</div>
<div class="form-check">
  <label class="form-check-label">
      <input type="checkbox" class="form-check-input" value="" disabled>Option 3
  </label>
</div>

Inline Checkbox -

form-check-inline : add to wrapper <div> to create inline checkboxes

<div class="form-check-inline">
  <label class="form-check-label">
      <input type="checkbox" class="form-check-input" value="">Option 1
  </label>
</div>
<div class="form-check-inline">
  <label class="form-check-label">
      <input type="checkbox" class="form-check-input" value="">Option 2
  </label>
</div>
<div class="form-check-inline">
  <label class="form-check-label">
      <input type="checkbox" class="form-check-input" value="" disabled>Option 3
  </label>
</div>

Radio Buttons -

form-check : add to wrapper <div> to create radio button
form-check-label : add to <label> to set label of radio button
form-check-input : add to <input> type radio
disabled : add to <input> to disable check item

<div class="form-check">
  <label class="form-check-label">
      <input type="radio" class="form-check-input" name="optradio">Option 1
  </label>
</div>
<div class="form-check">
  <label class="form-check-label">
      <input type="radio" class="form-check-input" name="optradio">Option 2
  </label>
</div>
<div class="form-check disabled">
  <label class="form-check-label">
      <input type="radio" class="form-check-input" name="optradio" disabled>Option 3
  </label>
</div>

Inline Radio Buttons -

form-check-inline : add to wrapper <div> to create inline radio buttons

<div class="form-check-inline">
  <label class="form-check-label">
      <input type="radio" class="form-check-input" name="optradio">Option 1
  </label>
</div>
<div class="form-check-inline">
  <label class="form-check-label">
      <input type="radio" class="form-check-input" name="optradio">Option 2
  </label>
</div>
<div class="form-check-inline disabled">
  <label class="form-check-label">
      <input type="radio" class="form-check-input" name="optradio" disabled>Option 3
  </label>
</div>

Selection Lists -

form-check : add to wrapper <div> to create select list
form-control : add to <select> for styling options

<div class="form-group">
  <label for="sel1">Select list:</label>
  <select class="form-control" id="sel1">
      <option>1</option>
      <option>2</option>
      <option>3</option>
      <option>4</option>
  </select>
</div>

# Input Group

input-group : add to wrapper <div> container to enhance input by adding icon/text/button in front/behind input field as help text
input-group-prepend : add to <div> for help text front of input
input-group-append : add to <div> for help text behind input
input-group-text : add to <span> for specified help text

Ex :

<form>
    <div class="input-group mb-3">
        <div class="input-group-prepend">
            <span class="input-group-text">@</span>
        </div>
        <input type="text" class="form-control" placeholder="Username">
    </div>
    <div class="input-group mb-3">
        <input type="text" class="form-control" placeholder="Your Email">
        <div class="input-group-append">
            <span class="input-group-text">@example.com</span>
        </div>
    </div>
</form>

Input Group Sizing :

input-group-sm|lg : add with .input-group for sizing input groups (default md)

Ex :

<form>
    <div class="input-group mb-3 input-group-sm">
         <div class="input-group-prepend">
             <span class="input-group-text">Small</span>
        </div>
        <input type="text" class="form-control">
    </div>
</form>

Multiple Inputs & Helpers :

Multiple Inputs -

<form>
    <div class="input-group mb-3">
        <div class="input-group-prepend">
            <span class="input-group-text">Person</span>
        </div>
        <input type="text" class="form-control" placeholder="First Name">
        <input type="text" class="form-control" placeholder="Last Name">
    </div>
</form>

Multiple Helper Text -

<form>
    <div class="input-group mb-3">
        <div class="input-group-prepend">
            <span class="input-group-text">One</span>
            <span class="input-group-text">Two</span>
            <span class="input-group-text">Three</span>
        </div>
        <input type="text" class="form-control">
    </div>
</form>

Input Group with Checkboxes & Radios :

Checkboxes -

<div class="input-group mb-3">
    <div class="input-group-prepend">
        <div class="input-group-text">
            <input type="checkbox">
        </div>
    </div>
    <input type="text" class="form-control" placeholder="Some text">
</div>

Radios -

<div class="input-group mb-3">
    <div class="input-group-prepend">
        <div class="input-group-text">
            <input type="radio">
        </div>
    </div>
    <input type="text" class="form-control" placeholder="Some text">
</div>

Input Group Buttons :

Basic Button -

<div class="input-group mb-3">
    <div class="input-group-prepend">
        <button class="btn btn-outline-primary" type="button">Basic Button</button>
    </div>
    <input type="text" class="form-control" placeholder="Some text">
</div>

Go Button -

<div class="input-group mb-3">
    <input type="text" class="form-control" placeholder="Search">
    <div class="input-group-append">
        <button class="btn btn-success" type="submit">Go</button>
    </div>
</div>

Ok & Cancel Button -

<div class="input-group mb-3">
    <input type="text" class="form-control" placeholder="Something clever..">
    <div class="input-group-append">
        <button class="btn btn-primary" type="button">OK</button>
        <button class="btn btn-danger" type="button">Cancel</button>
    </div>
</div>

Input Group with Dropdown Button -

<div class="input-group mt-3 mb-3">
    <div class="input-group-prepend">
        <button type="button" class="btn btn-outline-secondary dropdown-toggle" data-toggle="dropdown">
            Dropdown button
        </button>
        <div class="dropdown-menu">
            <a class="dropdown-item" href="#">Link 1</a>
            <a class="dropdown-item" href="#">Link 2</a>
            <a class="dropdown-item" href="#">Link 3</a>
        </div>
    </div>
    <input type="text" class="form-control" placeholder="Username">
</div>

Input Group Labels -

<form>
    <label for="demo">Write your email here:</label>
    <div class="input-group mb-3">
        <input type="text" class="form-control" placeholder="Email" id="demo" name="email">
        <div class="input-group-append">
            <span class="input-group-text">@example.com</span>
        </div>
    </div>
</form>

# Custom Forms

custom-control : add to wrapper <div> around <input> to create custom forms
custom-control-inline : add with .custom-control to create inline custom form element
custom-control-label : add to <label> inside .custom-control for label text

Ex :

<form>
    <div class="custom-control custom-radio custom-control-inline">
        <input type="radio" class="custom-control-input" id="customRadio" name="example" value="customEx">
        <label class="custom-control-label" for="customRadio">Custom radio 1</label>
    </div>
    <div class="custom-control custom-radio custom-control-inline">
        <input type="radio" class="custom-control-input" id="customRadio2" name="example" value="customEx">
        <label class="custom-control-label" for="customRadio2">Custom radio 2</label>
    </div>
</form>

Custom Checkbox :

custom-control-input : add to <input>
custom-checkbox : add with .custom-control for custom checkboxes

Ex :

<form>
    <div class="custom-control custom-checkbox">
        <input type="checkbox" class="custom-control-input" id="customCheck" name="example1">
        <label class="custom-control-label" for="customCheck">Check this custom checkbox</label>
    </div>
</form>

Custom Switch :

custom-control-input : add to <input>
custom-switch : add with .custom-control for custom switch

<form>
    <div class="custom-control custom-switch">
        <input type="checkbox" class="custom-control-input" id="switch1">
        <label class="custom-control-label" for="switch1">Toggle me</label>
    </div>
</form>

Custom Radio buttons :

custom-control-input : add to <input>
custom-radio : add with .custom-control for custom radio buttons

<form>
    <div class="custom-control custom-radio">
        <input type="radio" class="custom-control-input" id="customRadio" name="example1" value="customEx">
        <label class="custom-control-label" for="customRadio">Custom radio</label>
    </div>
</form>

Custom Select Menu :

custom-select : add to <select> element for custom select menu
custom-select-sm|lg : add to <select> element for sizing custom select menu (default md)

<form>
    <select name="cars" class="custom-select">
        <option selected>Custom Select Menu</option>
        <option value="volvo">Volvo</option>
        <option value="fiat">Fiat</option>
        <option value="audi">Audi</option>
    </select>
</form>

Small Custom Select Menu -

<form>
    <select name="cars" class="custom-select-sm">
        <option selected>Small Custom Select Menu</option>
        <option value="volvo">Volvo</option>
        <option value="fiat">Fiat</option>
        <option value="audi">Audi</option>
    </select>
</form>

Custom Range :

custom-range : add to <input> type range for custom range

<form>
    <label for="customRange">Custom range</label>
    <input type="range" class="custom-range" id="customRange" name="points1">
</form>

Custom File Upload :

custom-file : add to wrapper <div> element for custom file upload
custom-file-input : add to <input> type file for custom file upload

<form>
    <div class="custom-file">
        <input type="file" class="custom-file-input" id="customFile">
        <label class="custom-file-label" for="customFile">Choose file</label>
    </div>
</form>

<script>
// Add the following code if you want the name of the file appear on select -
$(".custom-file-input").on("change", function() {
    var fileName = $(this).val().split("\\").pop();
    $(this).siblings(".custom-file-label").addClass("selected").html(fileName);
});
</script>

# Flexbox

d-flex : add it to <div> to create flexbox container & transforms direct children into flex items
d-md|sm|lg|xl-flex : add it to <div> to create flexbox container on specific screen size

Note : max columns are 12.

Ex :

<div class="d-flex p-3 bg-secondary text-white">
    <div class="p-2 bg-info">Flex item 1</div>
    <div class="p-2 bg-warning">Flex item 2</div>
    <div class="p-2 bg-primary">Flex item 3</div>
</div>

Inine Flexbox :

d-inline-flex : add it to <div> to create inline flexbox container
d-sm|md|lg|xl-inline-flex : add it to <div> to create inline flexbox container on specific screen size

Ex :

<div class="d-inline-flex p-3 bg-secondary text-white">
    <div class="p-2 bg-info">Flex item 1</div>
    <div class="p-2 bg-warning">Flex item 2</div>
    <div class="p-2 bg-primary">Flex item 3</div>
</div>

Horizontal Direction Flexbox Items :

flex-row : add with .d-flex to display flex items horizontally (side by side)
flex-row-reverse : add with .d-flex to right-align horizontal direction

Ex :

<div class="d-flex flex-row bg-secondary">
    <div class="p-2 bg-info">Flex item 1</div>
    <div class="p-2 bg-warning">Flex item 2</div>
    <div class="p-2 bg-primary">Flex item 3</div>
</div>

Vertical Direction Flexbox Items :

flex-column : add with .d-flex to display flex items vertically (on top of each other)
flex-column-reverse : add with .d-flex to reverse vertical direction

Ex :

<div class="d-flex flex-column">
    <div class="p-2 bg-info">Flex item 1</div>
    <div class="p-2 bg-warning">Flex item 2</div>
    <div class="p-2 bg-primary">Flex item 3</div>
</div>

Justify Content Flex Items (align) :

justify-content-start|end|center|between|around : add with .d-flex to justify inside content to following

Ex :

<div class="d-flex justify-content-start">...</div>
<div class="d-flex justify-content-center">...</div>
<div class="d-flex justify-content-end">...</div>

Fill/Equal Width Flex Items :

flex-fill : add to each flex item to force them into equal widths

Ex :

<div class="d-flex">
    <div class="p-2 bg-info flex-fill">Flex item 1</div>
    <div class="p-2 bg-warning flex-fill">Flex item 2</div>
    <div class="p-2 bg-primary flex-fill">Flex item 3</div>
</div>

Flex Grow & Shrink :

flex-grow-1 : add to flex item to take up rest of space
flex-shrink-1 : add to flex item to make it shrink if necessary

Ex :

<div class="d-flex">
    <div class="p-2 bg-info">Flex item 1</div>
    <div class="p-2 bg-primary flex-grow-1">Flex item 2</div>
</div>

Flex Order :

order : add to flex items to change visual order of specific flex item

Note : Valid classes are from 0-12. The lowest number has the highest priority, i.e., order-1 is shown before order-2.

Ex :

<div class="d-flex bg-secondary">
    <div class="p-2 bg-info order-3">Flex item 1</div>
    <div class="p-2 bg-warning order-2">Flex item 2</div>
    <div class="p-2 bg-primary order-1">Flex item 3</div>
</div>

Flex Wrap :

Controls how flex items are wrapped in flex containers.

flex-nowrap : add with d-flex to no wrapping to flex container (default)
flex-wrap : add with d-flex to wrap flex container
flex-wrap-reverse : add with d-flex to reverse wrap flex container

Ex :

<div class="d-flex flex-wrap">..</div>
<div class="d-flex flex-wrap-reverse">..</div>
<div class="d-flex flex-nowrap">..</div>

Auto Margins :

Add auto margins to flex items with .mr-auto, push items to right -

<div class="d-flex bg-secondary">
  <div class="p-2 mr-auto bg-info">Flex item 1</div>
  <div class="p-2 bg-warning">Flex item 2</div>
  <div class="p-2 bg-primary">Flex item 3</div>
</div>

Add auto margins to flex items with .ml-auto, push items to left -

<div class="d-flex bg-secondary">
  <div class="p-2 bg-info">Flex item 1</div>
  <div class="p-2 bg-warning">Flex item 2</div>
  <div class="p-2 ml-auto bg-primary">Flex item 3</div>
</div>

Flex Align Content :

Controls the vertical alignment of gathered flex items.

align-content-start|end|center|between|around|stretch : add with d-flex for vertical alignment of gathered flex items

Note : These classes have no effect on single rows of flex items.

Ex :

<div class="d-flex flex-wrap align-content-start">..</div>
<div class="d-flex flex-wrap align-content-end">..</div>

Flex Align Items :

Controls the vertical alignment of single rows of flex items.

align-items-start|end|center|baseline|stretch : add with d-flex for vertical alignment of single rows of flex items

Ex :

<div class="d-flex align-items-start">..</div>
<div class="d-flex align-items-end">..</div>

Flex Align Self :

Controls the vertical alignment of a specified flex item.

align-self-start|end|center|baseline|stretch : add with d-flex for vertical alignment of specified flex item

Ex :

<div class="d-flex bg-light" style="height:150px">
    <div class="p-2 border">Flex item 1</div>
    <div class="p-2 border align-self-start">Flex item 2</div>
    <div class="p-2 border">Flex item 3</div>
</div>

Responsive Flex :

Note : * = sm|md|lg|xl

Flex Container -

d-*-flex : creates flexbox container for different screens
d-*-inline-flex : ceates inline flexbox container for different screens

Direction -

flex-*-row : display flex items horizontally on different screens
flex-*-row-reverse : display flex items horizontally, and right-aligned, on different screens
flex-*-column : display flex items vertically on different screens
flex-*-column-reverse : display flex items vertically, with reversed order, on different screens screens

Justified Content -

justify-content-*-start : display flex items from the start (left-aligned) on different screens
justify-content-*-end : display flex items at the end (right-aligned) on different screens
justify-content-*-center : display flex items in the center of flex container on different screens
justify-content-*-between : display flex items in "between" on different screens
justify-content-*-around : display flex items "around" on different screens

Fill/Equal Width -

flex-*-fill : force flex items into equal widths on different screens

Grow -

flex-*-grow-0 : don't make items grow on different screens
flex-*-grow-1 : make items grow on different screens

Shrink -

flex-*-shrink-0 : don't make items shrink on diferent screens
flex-*-shrink-1 : make items shrink on different screens

Order -

order-*-0-12 : change order from 0 to 12 on small screens

Wrap -

flex-*-nowrap : don't wrap items on different screens
flex-*-wrap : wrap items on different screens
flex-*-wrap-reverse : reverse wrapping of items on different screens

Align Content -

align-content-*-start : align gathered items from start on different screens
align-content-*-end : align gathered items at the end on different screens
align-content-*-center : align gathered items in the center on different screens
align-content-*-around : align gathered items "around" on different screens
align-content-*-stretch : stretch gathered items on different screens

Align Items -

align-items-*-start : align single rows of items from the start on different screens
align-items-*-end : align single rows of items at the end on different screens
align-items-*-center : align single rows of items in the center on different screens
align-items-*-baseline : align single rows of items on the baseline on different screens
align-items-*-stretch : stretch single rows of items on different screens

Align Self -

align-self-*-start : align flex item from the start on different screens
align-self-*-end : lign flex item at the end on different screens
align-self-*-center : align flex item in the center on different screens
align-self-*-baseline : align flex item on the baseline on different screens
align-self-*-stretch : stretch flex item on different screens

# Grid

row : add to <div> to create horizontal groups of columns
col : add to <div> inside .row to create column (must be immediate childs of row)
col-sm|md|lg|xl : create responsive col - decide by us create equal of width
col-sm|md|lg|xl-n : responsive col that spans 1-12 rows (n = 1-12)
no-gutters : add with .row to remove gutters (extra space)

Note :

Rows must be placed in container or container-fluid.
Cols spanned must be sum to 12.
* = sm|md|lg|xl

Ex :

Create unequal col of 25% 50% 25% :

<div class="row">
    <div class="col-md-3"></div>
    <div class="col-md-6"></div>
    <div class="col-md-3"></div>
</div>

Create col of equal width (auto layout col) :

<div class="row">
    <div class="col-*"></div>
    <div class="col-*"></div>
    <div class="col-*"></div>
</div>

Stacked horizontally on large screens and stacked on top of each other on small screens :

<div class="container-fluid">
    <div class="row">
        <div class="col-sm-6">
            <p>Lorem ipsum...</p>
        </div>
        <div class="col-sm-6">
            <p>Sed ut perspiciatis...</p>
        </div>
    </div>
</div>

4 columns of 25% width each (auto layout col) :

<div class="row">
    <div class="col-sm">1 of 4</div>
    <div class="col-sm">2 of 4</div>
    <div class="col-sm">3 of 4</div>
    <div class="col-sm">4 of 4</div>
</div>

Nested Columns :

<div class="row">
    <div class="col-8">
        col-8
        <div class="row">
            <div class="col-6">col-6</div>
            <div class="col-6">col-6</div>
        </div>
    </div>
    <div class="col-4">col-4</div>
</div>

On Xtra Small Screen Devices :

Two cols of 25% 75% split on all devices (xsm, sm, md, lg, xl).

<div class="container-fluid">
    <div class="row">
        <div class="col-3 bg-success">
            <p>Lorem ipsum...</p>
        </div>
        <div class="col-9 bg-warning">
            <p>Sed ut perspiciatis...</p>
        </div>
    </div>
</div>

On Small Screen Devices :

Two cols of 25% 75% split on sm (md, lg, xl) devices, on x-sm devices it will automatically stack 100% width.

<div class="container-fluid">
    <div class="row">
        <div class="col-sm-3 bg-success">
            <p>Lorem ipsum...</p>
        </div>
        <div class="col-sm-9 bg-warning">
            <p>Sed ut perspiciatis...</p>
        </div>
    </div>
</div>

On Medium Screen Devices :

On sm size, look at classes with -sm- in them and use those & on md size look at classes with -md- in them and use those. 25% 75% split on sm devices & 50% 50% split on md (lg, xl) devices. on x-sm devices, it will automatically stack (100%) -

<div class="container-fluid">
    <div class="row">
        <div class="col-sm-3 col-md-6">
            <p>Lorem ipsum...</p>
        </div>
        <div class="col-sm-9 col-md-6">
            <p>Sed ut perspiciatis...</p>
        </div>
    </div>
</div>

Using Only Medium. md, lg, xl devices it split 50% 50%, for sm, x-sm devices it will stack vertically (100% width) -

<div class="row">
    <div class="col-md-6">
        <p>Lorem ipsum...</p>
    </div>
    <div class="col-md-6">
        <p>Sed ut perspiciatis...</p>
    </div>
</div>

On Large Screen Devices :

On sm size, look at classes with -sm-. on md size, look at classes with -md-. on lg size, look at classes with -lg-. 25% 75% split on sm devices, 50% 50% split on md devices & 33% 66% split on lg & xl devices. On x-sm devices, it will automatically stack (100%) -

<div class="container-fluid">
    <div class="row">
        <div class="col-sm-3 col-md-6 col-lg-4">
            <p>Lorem ipsum...</p>
        </div>
        <div class="col-sm-9 col-md-6 col-lg-8">
            <p>Sed ut perspiciatis...</p>
        </div>
    </div>
</div>

Using Only Large. lg & xl devices split 50% 50%, for md, sm & x-sm devices it will stack vertically (100% width) -

<div class="container-fluid">
    <div class="row">
        <div class="col-lg-6">
            <p>Lorem ipsum...</p>
        </div>
        <div class="col-lg-6">
            <p>Sed ut perspiciatis...</p>
        </div>
    </div>
</div>

On Extra Large Screen Devices :

25% 75% split on sm devices, 50% 50% split on md devices, 33% 66% split on lg & 20% 80% split on xl devices. On x-sm devices, it will automatically stack (100%) -

<div class="container-fluid">
    <div class="row">
        <div class="col-sm-3 col-md-6 col-lg-4 col-xl-2">
            <p>Lorem ipsum...</p>
        </div>
        <div class="col-sm-9 col-md-6 col-lg-8 col-xl-10">
            <p>Sed ut perspiciatis...</p>
        </div>
    </div>
</div>

Using Only XLarge. On xl devices, split 50% 50%. For lg, md, sm, x-sm devices, it will stack vertically (100% width) -

<div class="row">
    <div class="col-xl-6">
        <p>Lorem ipsum...</p>
    </div>
    <div class="col-xl-6">
        <p>Sed ut perspiciatis...</p>
    </div>
</div>

BOOTSTRAP 4

# Container Classes

Ex :

# Jumbotron Classes

Ex :

# Heading Classes

Ex :

# Typography Classes

Font Style :

Ex :

Text Alignment :

Ex :

Text Format & Cases :

Ex :

Lists Style :

Ex :

Text Format :

Ex :

Flex & Grid :

# Float and Clearfix

Ex :

Responive Floats Class :

Ex :

# Height and Width

Ex :

# Margin and Padding

Ex :

Center Align Element Using Margin :

# Vertical Align

Ex :

# Visibility

Ex :

# Position

Ex :

# Display Element

Ex :

Display as Table :

Ex :

Display as Flex :

Ex :

# Color Classes

Text Color Classes :

Ex :

Background Color Classes :

Ex :

# Screenreaders

Ex :

# Responsive Embeds

Ex :

# Border

Ex :

Contextual Border Color Classes :

Ex :

Border Radius Classes :

Ex :

# Shadow

Ex :

# Tables Classes

Ex :

Table Style Classes :

Ex :

Responsive Table :

Ex :

Table Header Color :

Ex :

Contextual Color Classes :

Ex :

# Image Classes

Ex :

Float Image To Center (Center Aligned Image) -

# Alert Box Classes

Ex :

Contextual Alert Classes :

Ex :

Alert Links Class :

Ex :

Animated Alerts :

Ex :

Close Button Class :

Ex :