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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 pt-3"> <h1>响应式容器</h1> <p>请调整浏览器窗口大小来查看效果。</p> </div> <div class="container-sm border">.container-sm</div> <div class="container-md mt-3 border">.container-md</div> <div class="container-lg mt-3 border">.container-lg</div> <div class="container-xl mt-3 border">.container-xl</div> <div class="container-xxl mt-3 border">.container-xxl</div> </body> </html>