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Bootstrap 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://cdn.staticfile.net/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
  <script src="https://cdn.staticfile.net/jquery/3.2.1/jquery.min.js"></script>
  <script src="https://cdn.staticfile.net/popper.js/1.15.0/umd/popper.min.js"></script>
  <script src="https://cdn.staticfile.net/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>

<div class="container mt-3">
  <h2>垂直方向</h2>
  <p>.flex-column 类用于设置弹性子元素垂直方向显示。</p>
  <p>使用 .flex-column-reverse 可以适应不同屏幕设置反向垂直子元素布局。重置浏览器查看效果。</p>
  <p><code>.flex-column-reverse</code>:</p>
  <div class="d-flex flex-column-reverse mb-3">
    <div class="p-2 bg-info">Flex item 1</div>
    <div class="p-2 bg-warning">Flex item 2</div>
    <div class="p-2 bg-primary">Flex item 3</div>
  </div>

<p><code>.flex-sm-column-reverse</code>:</p>
  <div class="d-flex flex-sm-column-reverse mb-3">
    <div class="p-2 bg-info">Flex item 1</div>
    <div class="p-2 bg-warning">Flex item 2</div>
    <div class="p-2 bg-primary">Flex item 3</div>
  </div>

<p><code>.flex-md-column-reverse</code>:</p>
  <div class="d-flex flex-md-column-reverse mb-3">
    <div class="p-2 bg-info">Flex item 1</div>
    <div class="p-2 bg-warning">Flex item 2</div>
    <div class="p-2 bg-primary">Flex item 3</div>
  </div>
  
  <p><code>.flex-lg-column-reverse</code>:</p>
  <div class="d-flex flex-lg-column-reverse mb-3">
    <div class="p-2 bg-info">Flex item 1</div>
    <div class="p-2 bg-warning">Flex item 2</div>
    <div class="p-2 bg-primary">Flex item 3</div>
  </div>
  
  <p><code>.flex-xl-column-reverse</code>:</p>
  <div class="d-flex flex-xl-column-reverse mb-3">
    <div class="p-2 bg-info">Flex item 1</div>
    <div class="p-2 bg-warning">Flex item 2</div>
    <div class="p-2 bg-primary">Flex item 3</div>
  </div>
</div>