双飞翼布局

  • float布局

  • margin负值

  • 防止两侧被覆盖，用margin

<!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>Document</title>
  <style>
    .fr{
      float: left;
    }
    .main{
      width: 100%;
      height: 100px;
      border: 1px solid pink;
    }
    .main-container{
      margin: 0 200px 0 200px;
    }
    .left{
      width: 200px;
      height: 100px;
      background: #ccc;
      margin-left: -100%;
    }
    .right{
      width: 200px;
      height: 100px;
      background: #233;
      color: #fff;
      margin-left: -200px;
    }
    .clearfix::after{
      content: '';
      display: table;
      clear: both;
    }
  </style>
</head>
<body>
  <div class="container clearfix">
    <div class="main fr">
      <div class="main-container">
        233333
      </div>
    </div>
    <div class="left fr">left</div>
    <div class="right fr">right</div>
  </div>
</body>
</html>

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