console 命令行工具 X clear

console

<div class="a">
  <div class="b">
    AAAA
  </div>
</div>

div {
  transition: 1s ease-in-out;
}
.a {
  width: 100px;
  height: 100px;
  border: 1px solid red;
  color: red;
}
.a:hover {
  color: blue;
  border-color: blue;
}