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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 Left 与 Right 工具</h1>
  <p>Margin X utilities:</p>
  <div class="mx-0 bg-warning">Margin X 0</div>
  <div class="mx-1 bg-warning">Margin X 1</div>
  <div class="mx-2 bg-warning">Margin X 2</div>
  <div class="mx-3 bg-warning">Margin X 3</div>
  <div class="mx-4 bg-warning">Margin X 4</div>
  <div class="mx-5 bg-warning">Margin X 5</div>
  <div class="mx-auto bg-warning" style="width:150px">Margin X Auto</div>
  <br>
  
  <p>响应式 margin x 工具，重置浏览器大小查看效果。</p>
  <div class="mx-sm-5 bg-warning">Margin X 5 on SM screens</div>
  <div class="mx-md-5 bg-warning">Margin X 5 on MD screens</div>
  <div class="mx-lg-5 bg-warning">Margin X 5 on LG screens</div>
  <div class="mx-xl-5 bg-warning">Margin X 5 on XL screens</div>
</div>