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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <div class="outer">
    <div class="inner">
      <a>hehe</a>
      
    </div>
  </div>
</body>
</html>
 
.outer{
  display:flex;
  width:100%;
  background:blue;
}
.inner{
  width:50%;
  background:yellow;
  padding-bottom:50%;
}
Output 300px

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yiochenpro
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