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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>延展一个单独子元素(默认)</h2>
  <p>.align-self-*-stretch 类据不同屏幕设备，延展一个单独子元素。</p>

<p><code>.align-self-stretch</code>:</p>
  <div class="d-flex bg-light" style="height:150px">
    <div class="p-2 border">Flex item 1</div>
    <div class="p-2 border align-self-stretch">Flex item 2</div>
    <div class="p-2 border">Flex item 3</div>
  </div>
  <br>

<p><code>.align-self-sm-stretch</code>:</p>
  <div class="d-flex bg-light" style="height:150px">
    <div class="p-2 border">Flex item 1</div>
    <div class="p-2 border align-self-sm-stretch">Flex item 2</div>
    <div class="p-2 border">Flex item 3</div>
  </div>
  <br>

<p><code>.align-self-md-stretch</code>:</p>
  <div class="d-flex bg-light" style="height:150px">
    <div class="p-2 border">Flex item 1</div>
    <div class="p-2 border align-self-md-stretch">Flex item 2</div>
    <div class="p-2 border">Flex item 3</div>
  </div>
  <br>

<p><code>.align-self-lg-stretch</code>:</p>
  <div class="d-flex bg-light" style="height:150px">
    <div class="p-2 border">Flex item 1</div>
    <div class="p-2 border align-self-lg-stretch">Flex item 2</div>
    <div class="p-2 border">Flex item 3</div>
  </div>
  <br>

<p><code>.align-self-xl-stretch</code>:</p>
  <div class="d-flex bg-light" style="height:150px">
    <div class="p-2 border">Flex item 1</div>
    <div class="p-2 border align-self-xl-stretch">Flex item 2</div>
    <div class="p-2 border">Flex item 3</div>
  </div>
  <br>
</div>