Bootstrap 5 Containers

Bootstrap requires a containing element to wrap site contents. Containers are used to pad the content inside of them, Following are the container classes available in bootstrap 5

.container : a responsive fixed width container
.container-fluid : full width container, wrapping the entire width of the viewport
.container-{breakpoint}, which is width: 100%

Extra small
<576px
Small
≥576px
Medium
≥768px
Large
≥992px
X-Large
≥1200px
XX-Large
≥1400px
.container100%540px720px960px1140px1320px
.container-sm100%540px720px960px1140px1320px
.container-md100%100%720px960px1140px1320px
.container-lg100%100%100%960px1140px1320px
.container-xl100%100%100%100%1140px1320px
.container-xxl100%100%100%100%100%1320px
.container-fluid100%100%100%100%100%100%

Example container

<!doctype html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <!-- Bootstrap CSS -->
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">

    <title>Hello, world!</title>
  </head>
  <body>

<!-- Sample Code ! -->

	<div class="container">
  		<h1>My First Bootstrap Page</h1>
 	 	<p>This is some text.</p>
	</div>

    <!-- Optional JavaScript; choose one of the two! -->

    <!-- Option 1: Bootstrap Bundle with Popper -->
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-MrcW6ZMFYlzcLA8Nl+NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP+JcXn/tWtIaxVXM" crossorigin="anonymous"></script>

    <!-- Option 2: Separate Popper and Bootstrap JS -->
    <!--
    <script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.9.2/dist/umd/popper.min.js" integrity="sha384-IQsoLXl5PILFhosVNubq5LC7Qb9DXgDA9i+tQ8Zj3iwWAwPtgFTxbJ8NT4GN1R8p" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.min.js" integrity="sha384-cVKIPhGWiC2Al4u+LWgxfKTRIcfu0JTxR+EQDz/bgldoEyl4H0zUF0QKbrJ0EcQF" crossorigin="anonymous"></script>
    -->
  </body>
</html>

Copy the above code to a notepad and save it as example.html then open it in a browser.

The XXL breakpoint (=1400px) is new in Bootstrap 5, while the largest breakpoint in Bootstrap 4 is Extra large (=1200px).

Change the .container class to .container-fluid and see the changes . this will always span the entire width of the screen (width is always 100%):