console 命令行工具 X clear

console

<div class="container"> 
  <div class="fixed"> </div>
</div>

.container {
  width:400px;
  height: 400px;
  background: blue;
  margin: 40px;
  /* transform: translateX(10px) */
}

.fixed {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(100, 100, 255, .8);
}