在bootstrap 5版本中，大屏幕类无法工作。你觉得呢?如果有人知道，请帮助我。我真的很困惑。
<!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@5.0.0-beta1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-giJF6kkoqNQ00vy+HMDP7azOuL0xtbfIcaT9wjKHr8RbDVddVHyTfAAsrekwKmP1" crossorigin="anonymous">
<title>Hello, world!</title>
</head>
<body>
<h1 class="jumbotron">Hello, world!</h1>
<!-- Optional JavaScript; choose one of the two! -->
<!-- Option 1: Bootstrap Bundle with Popper -->
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/js/bootstrap.bundle.min.js" integrity="sha384-ygbV9kiqUc6oa4msXn9868pTtWMgiQaeYH7/t7LECLbyPA2x65Kgf80OJFdroafW" crossorigin="anonymous"></script>
<!-- Option 2: Separate Popper and Bootstrap JS -->
<!--
<script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.5.4/dist/umd/popper.min.js" integrity="sha384-q2kxQ16AaE6UbzuKqyBE9/u/KzioAlnx2maXQHiDX9d4/zp8Ok3f+M7DPm+Ib6IU" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/js/bootstrap.min.js" integrity="sha384-pQQkAEnwaBkjpqZ8RU1fF1AKtTcHJwFl3pblpTlHXybJjHpMYo79HY3hIi4NKxyj" crossorigin="anonymous"></script>
-->
</body>
</html>大屏幕组件被删除，以支持实用程序类，如
.bg-light为背景色，.p-*为控制类填充。
https://getbootstrap.com/docs/5.0/migration/的超大
超大屏幕类已在引导5中删除。如果您仍然需要它，请使用Bootstrap 4，将h1标签替换为div，并放置"Hello, world";在一个嵌套的h1。这应该可以工作:
<div class="jumbotron">
<h1 class="display-4">Hello, world!</h1>
</div>
来源:https://getbootstrap.com/docs/4.0/components/jumbotron/