console 命令行工具 X clear

console

<div class="demo">
</div>

.demo {
  width: 100px;
  height: 100px;
  background-color: #45dc31;
  border-radius: 0;
  transition: 1s;
}

.demo:hover {
  width: 200px;
  border-radius: 50%;
  background-color: red;
}