伪元素清除浮动 

<!DOCTYPE html>
<html lang="en">
<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>伪元素清除浮动影响</title>
  <style>
    *{
      padding:0;
      margin:0;
      box-sizing: border-box;
    }
     .red{
       width:300px;
       height:200px;
       background-color:red;
       float: left;
     }
     .green{
       width:300px;
       height:200px;
       background-color:green;
       float: left;
     }
     .blue{
       width:300px;
       height:220px;
       background-color:blue;
     }
     /* 清除浮动影响  */
/* 在clearFix元素所有内容之后插入一个节点 */
     .clearFix::after{
       content:'0';
       /* 伪元素彻底不显示 */
       line-height:0;
       font-size:0;
       height:0;

       display:block;
       clear:both;

     }

  </style>
</head>
<body>
  <div class="clearFix">

  <div class="red "></div>
  <div class="green "></div>
  
</div>
  <div class="blue"></div>
</body>
</html>

　　

posted @ 2020-02-25 15:26  给与时间以生命  阅读(342)  评论(0)    收藏  举报