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<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.net/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="stylesheet">
  <script src="https://cdn.staticfile.net/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js"></script>
</head>
<body>
​
<div class="container mt-3">
  <h2>Flex</h2>
  <p>根据不同的屏幕设备创建弹性盒子容器, d-*-flex 类可以控制弹性元素的布局。</p>
  <p>重置浏览器查看效果。</p>
  <div class="d-flex bg-success">d-flex</div>
  <span class="d-sm-flex bg-success">d-sm-flex</span>
  <span class="d-md-flex bg-success">d-md-flex</span>
  <span class="d-lg-flex bg-success">d-lg-flex</span>
  <span class="d-xl-flex bg-success">d-xl-flex</span>
  <span class="d-xxl-flex bg-success">d-xxl-flex</span>
</div>
​
</body>
</html>