console 命令行工具 X clear

console

<div class="container">
<div class="middle">中</div>
<div class="left">左</div>
<div class="right">右</div>
</div>

*{
   margin: 0;
   padding: 0
}
body{
    width: 100vw;
    height: 100vh
}
.middle{
    height: 100
}