Bootstrap 5

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Grid system

Breakpoints

Bootstrap includes six default breakpoints, sometimes referred to as grid tiers, for building responsively.

class dimension
col- col-auto- adaptation de la largeur au contenu
col-sm- ≥ 576px
col-md- ≥ 768px
col-lg- ≥ 992px
col-xl- ≥ 1200px
col-xxl- ≥ 1400px

Grid layout

Une page est divisé en 12 colonnes.
Html.svg
<!-- définit une ligne -->
<div class="row">
    <!-- définit 3 colonnes de même taille -->
    <div class="col">...</div>
    <div class="col">...</div>
    <div class="col">...</div>

<div class="row">
    <!-- définit 3 colonnes, la première 2x plus large que les autres. Il y a 12 colonnes (6-3-3) -->
    <div class="col-6">...</div>
    <div class="col">...</div>
    <div class="col">...</div>

<!-- centrer verticalement tous les éléments de la ligne -->
<div class="row align-items-center">
    <!-- centrer verticalement un élément de la ligne -->
    <div class="col align-self-center">...</div>

<!-- centrer horizontalement la ligne -->
<div class="row justify-content-center">

Utilities

Margin / Padding

Classes
class Description
m-0 margin: 0 !important
p-3 padding: 1rem !important
mx-auto margin-right: auto !important
margin-left: auto !important
Sides
Side Description
t top
b bottom
s start (left in LTR)
e end (right in LTR)
x left and right
y top and bottom
Values
Value Description
0 0
1 $spacer * .25 = 0.25rem
2 $spacer * .5 = 0.5rem
3 $spacer = 1rem
4 $spacer * 1.5 = 1.5rem
5 $spacer * 3 = 3rem
auto auto

Sizing - Width - Height

Html.svg
<div class="w-25">Width 25%</div>
<div class="w-50">Width 50%</div>
<div class="w-75">Width 75%</div>
<div class="w-100">Width 100%</div>
<div class="w-auto">Width auto</div>

<div class="h-25">Height 25%</div>

<div class="mw-100">Max width 100%</div>

<div class="vw-100">Width 100vw</div>

Text

classe Description
text-center centrer aligned text
text-end end (right) aligned text
text-uppercase uppercased text
fw-bold bold text

Display

classe Description
d-block generating line breaks both before and after the element
d-inline do not generate line breaks before or after the element
d-none turn off the display of the element

Colors

classe Description
text-primary blue
text-secondary grey
text-success green
text-danger red
text-warning yellow
text-info light blue
bg-transparent transparent

Components

Button

btn-primary btn-secondary btn-success btn-danger btn-warning btn-info btn-light btn-dark btn-link
bleu gris vert rouge jaune cyan blanc noir texte souligné bleu
Html.svg
<button type="button" class="btn btn-primary oi oi-magnifying-glass" />

Collapse

Html.svg
<a data-bs-toggle="collapse" href="#filter" role="button" aria-expanded="false" aria-controls="filter">
    <i class="fa fa-filter"></i>
</a>

<div class="collapse" id="filter">
</div>

Dropdowns

Html.svg
<div class="dropdown">
    <i class="bi bi-three-dots-vertical dropdown-toggle hidden-arrow" data-bs-toggle="dropdown"></i>
    <ul class="dropdown-menu">
        <li><i class="bi bi-pencil dropdown-item"></i></li>
        <li><i class="bi bi-trash3 dropdown-item"></i></li>
    </ul>
</div>
Css.svg
/* create the hidden-arrow class to hide the arrow*/
.dropdown .hidden-arrow.dropdown-toggle:after {
    display: none;
}

/* reset the min-width for dropdown-menu (set to 10rem) */
.dropdown-menu {
    min-width: auto;
}

Toasts

Forms

Floating labels

Html.svg
<div class="form-floating">
  <input type="email" class="form-control" id="floatingInput" placeholder="name@example.com">
  <label for="floatingInput">Email address</label>
</div>

Mouse

Use role="button" to set the mouse cursor to pointer when hovering.

Bootstrap Icons

Bootswatch themes

Download bootstrap.min.css then add it in the web page.

Installation

Download compiled code or use a CDN url or a package manager (LibMan) to get bootstrap.

Html.svg
<!-- CDN -->
<!-- CSS -->
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/css/bootstrap.min.css" rel="stylesheet" 
      integrity="sha384-+0n0xVW2eSR5OomGNYDnhzAbDsOXxcvSN1TPprVMTNDbiYZCxYbOOl7+AMvyTG2x" crossorigin="anonymous">
<!-- JavaScript Bundle with Popper -->
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/js/bootstrap.bundle.min.js"
        integrity="sha384-gtEjrD/SeCtmISkJkNUaaKMoLD0//ElJ19smozuHV6z3Iehds+3Ulb9Bn9Plx0x4" crossorigin="anonymous"></script>

<!-- file in wwwroot -->
<!-- CSS -->
<link rel="stylesheet" href="lib/bootstrap/dist/css/bootstrap.min.css" />
<!-- JavaScript Bundle with Popper -->
<script src="lib/bootstrap/dist/js/bootstrap.bundle.min.js"></script>

Files

File Description
bootstrap.min.css Layout, Content, Components and Utilities included
bootstrap.min.js minimal js
bootstrap.bundle.min.js Popper included

Migrating to v5

v4 v5 description
ml-x ms-x margin
text-right text-end text align