前端开发单位em

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

  <style>
    *{
      padding: 0;
      margin: 0;

    }
    .father{
      font-size: 12px;

    }
    .son{
      width: 10em;
      height: 10em;
      background: blue;
    }

  </style>
</head>
<body>
<div class="father">
  <div class="son"></div>
</div>
</body>
</html>

前端开发单位em

效果图:

前端开发单位em

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