console 命令行工具 X clear

console

<div class="blue"></div>
<div class="red-outer">
  <div class="red-inner">red inner</div>
</div>

.blue, .red-inner {
  height: 50px;
  margin: 10px 0;
}

.blue {
  background: blue;
}

.red-outer {
  background: red;
  overflow: hidden;

}