console 命令行工具 X clear

console

<div class="box">
      <div class="con">11</div>
</div>

.box{
  width:300px;
  height:300px;
  border:1px solid #333;
  text-align:center;
  vertical-align:middle;
  line-height:300px;
}

.con{
  display:inline-block;
  width:100px;
  height:100px;
  border:1px solid #f00;
}