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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>

<div class="container mt-3">
  <h1>Margin Top 与 Bottom 工具</h1>
  <p>Margin Y 工具:</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 工具，重置浏览器大小查看效果。</p>
  <div class="my-sm-5 bg-warning">Margin Y 5 on SM screens</div>
  <div class="my-md-5 bg-warning">Margin Y 5 on MD screens</div>
  <div class="my-lg-5 bg-warning">Margin Y 5 on LG screens</div>
  <div class="my-xl-5 bg-warning">Margin Y 5 on XL screens</div>
</div>