console 命令行工具 X clear

console

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

.a{
  width: 20px;
  height: 50px;
  background: red;
  transition: width 1s linear;
  margin-left: 200px;
  transform: translateX(-100%);
}
.a:hover {
  width: 100px;
  transition: width 1s linear;
  transform: translateX(-100%);
}