外边距典型应用-块级盒子水平居中对齐 

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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>块级盒子水平居中对齐</title>
    <style>
      .header {
          width: 900px;
          height: 200px;
          background-color: pink;
          margin: 100px auto;
      }
    </style>
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    <div class="header"></div>
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posted @ 2021-11-14 16:04  awsoyou  阅读(63)  评论(0)    收藏  举报