console 命令行工具 X clear

console

<div class="border">
  <div class="border2">
    
  </div>
</div>

.border{
  width:400px;
  height:1020px;
  border:solid 2px;
  border-radius:20px;

}
.border2{
  width:360px;
  height:900px;
  border:solid 2px;
  border-radius:20px;
  margin: 50px auto;

}