代码示例：（标识：bs_grid_xxl_auto）
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/5.1.2/css/bootstrap.min.css" rel="stylesheet">
<script src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/5.1.2/js/bootstrap.bundle.js"></script>
</head>
<body>
<div class="container-fluid mt-3">
<h1>响应式自动布局列</h1>
<p>在 Bootstrap 5 中，有一种简单的方法可以为所有设备创建等宽的列：只需从 .col-xxl-* 中删除数字，并仅在 col 元素上使用 .col-xxl 类。 Bootstrap 将识别有多少列，并且每列将获得相同的宽度。</p>
<p>如果屏幕尺寸小于 1400px，列将水平堆叠：</p>
<div class="container-fluid">
<div class="row">
<div class="col-xxl bg-primary text-white">1 of 2</div>
<div class="col-xxl bg-dark text-white">2 of 2</div>
</div>
</div>
<br>
<div class="container-fluid">
<div class="row">
<div class="col-xxl bg-primary text-white">1 of 4</div>
<div class="col-xxl bg-dark text-white">2 of 4</div>
<div class="col-xxl bg-primary text-white">3 of 4</div>
<div class="col-xxl bg-dark text-white">4 of 4</div>
</div>
</div>
</div>
</body>
</html>
