console 命令行工具 X clear

console

<div class="main" style="width: 100%;height: 400px;">
    <div class="left" style="width: 200px;height: 200px;background: red;"></div>
    <div class="right" style="background: blue;height: 200px;"></div>
</div>

html,body{
  margin:0;
  padding:0;
}
.left{
  float: left;
}
.right{
   overflow: hidden;
}