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<!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.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"> <h1>下外边距 Utility</h1> <div class="mb-0 bg-warning">Margin Bottom 0</div> <div class="mb-1 bg-warning">Margin Bottom 1</div> <div class="mb-2 bg-warning">Margin Bottom 2</div> <div class="mb-3 bg-warning">Margin Bottom 3</div> <div class="mb-4 bg-warning">Margin Bottom 4</div> <div class="mb-5 bg-warning">Margin Bottom 5</div> <div class="mb-auto bg-warning" style="width:150px">Margin Bottom Auto</div> <br> <p>响应式下外边距实用工具。请调整浏览器窗口大小以查看效果：</p> <div class="mb-sm-5 bg-warning">在 SM 屏幕上的 Margin Bottom 5</div> <div class="mb-md-5 bg-warning">在 MD 屏幕上的 Margin Bottom 5</div> <div class="mb-lg-5 bg-warning">在 LG 屏幕上的 Margin Bottom 5</div> <div class="mb-xl-5 bg-warning">在 XL 屏幕上的 Margin Bottom 5</div> </div> </body> </html>