console 命令行工具 X clear

console

<div class='border-half'></div>

body{
  background:blue;
}
.border-half{
  width:10em;
  height:10em;
  background:yellow;
  margin:0 auto;
  border:2em solid hsla(0,0%,100%,0.5);
  background-clip:padding-box;
}