console 命令行工具 X clear
console
<!DOCTYPE html>
<html>  
<head> 
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  <!--The viewport meta tag is used to improve the presentation and behavior of the samples 
    on iOS devices-->
  <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no"/>
  <title></title>
 
  <style> 
    html, body { height: 100%; width: 100%; margin: 0; padding: 0; }
    .left{
      background:pink;
      float: left;
      width:180px;
    }
    .center{
      background:lightyellow;
      overflow:hidden;
      
    }
    .right{
      background: lightblue;
      width:180px;
      float:right;
    }
  </style> 
  
  
</head> 
 
<body class="claro"> 
  <div class="container">
    <div class="left">
      <pre>
  .left{
    background:pink;
    float: left;
    width:180px;
  }
      </pre>
    </div>
    <div class="right">
       <pre>
  .right{
    background:lightblue;
    width:180px;
    float:right;
  }
      </pre>
    </div>
    <div class="center">
    <pre>
  .center{
    background:lightyellow;
    overflow:hidden;
    height:116px;
  }
      </pre>
    </div>
  </div>
 
</html>