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<!DOCTYPE html> <html lang="en"> <head> <title>Bootstrap 实例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.2/dist/css/bootstrap.min.css" rel="stylesheet"> <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.2/dist/js/bootstrap.bundle.min.js"></script> </head> <body> <div class="container mt-3"> <h2>弹性框</h2> <p>如需创建 flexbox 容器，请添加 d-flex 类。请使用任何 d-*-flex 类来控制元素何时应该是特定屏幕宽度上的 flex 元素。</p> <p>请调整浏览器窗口大小来查看效果。</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>