CSS之经典flex布局-垂直居中

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>flex垂直居中</title>
  <style>
      html,body {
        width: 100%;
        height: 100%;
        margin: 0
      }
      #main {
        width: 100%;
        height: 100%;
        display: flex;
        justify-content: center;
        align-items: center;
      }
      .center {
        width: 100px;
        height: 100px;
        background: red
      }
  </style>
</head>
<body>
   <div id="main">
      <div class='center'></div>
   </div>
</body>
</html>

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