console 命令行工具 X clear

console

<div id='container'>
<div id='d1'>d1</div>
<div id='d2'>d2</div>
</div>

#container {
  position： relative;
}
#d1 {
  height: 100px;
  background-color: blue;
  z-index: 200;
}
#d2 {
  z-index: 200;
  margin-top: -50px;
  height: 200px;
  background-color: red;
}