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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>上下外边距 Utility</h1> <p>Margin Y utilities:</p> <div class="my-0 bg-warning">Margin Y 0</div> <div class="my-1 bg-warning">Margin Y 1</div> <div class="my-2 bg-warning">Margin Y 2</div> <div class="my-3 bg-warning">Margin Y 3</div> <div class="my-4 bg-warning">Margin Y 4</div> <div class="my-5 bg-warning">Margin Y 5</div> <div class="my-auto bg-warning">Margin Y Auto</div> <br> <p>响应式 margin y 实用工具。请调整浏览器窗口大小以查看效果：</p> <div class="my-sm-5 bg-warning">在 SM 屏幕上的 Margin Y 5</div> <div class="my-md-5 bg-warning">在 MD 屏幕上的 Margin Y 5</div> <div class="my-lg-5 bg-warning">在 LG 屏幕上的 Margin Y 5</div> <div class="my-xl-5 bg-warning">在 XL 屏幕上的 Margin Y 5</div> </div> </body> </html>