console 命令行工具 X clear

console

<div class="outer">
  <div class="inner">
  </div>
</div>

.outer {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100px;
  border: 1px dashed black;
}

.inner {
  width: 50px;
  height:50px;
  background-color: black;
}