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清除浮动之双伪元素法

<!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>清除浮动之双伪元素法</title>
<style>
  .box {
    width: 800px;
    border: 1px solid blue;
    margin: 0 auto;
    background-color: gray;
  }
  /* 清除浮动 */
  .clearfix:before,.clearfix:after {
    content: "";
    display: table;
  }
  .clearfix:after {
    clear: both;
  }
  .clearfix {
    *zoom: 1;
  }

  .damao {
    width: 300px;
    height: 200px;
    background-color: purple;
    float: left;
  }
  .ermao {
    width: 200px;
    height: 200px;
    background-color: pink;
    float: left;
  }

  .footer {
    height: 200px;
    background-color: black;
  }
</style>

</head> <body>

<div class="box clearfix">
  <div class="damao">大毛</div>
  <div class="ermao">二毛</div>
  <div class="ermao">二毛</div>
  <div class="ermao">二毛</div>
  <div class="ermao">二毛</div>
  <div class="ermao">二毛</div>
</div>
<div class="footer"></div>

</body></html>