console 命令行工具 X clear

console

<div class="root">
    <div class="box"></div>
</div>

.root {
    background-color: red;
    width: 200px;
    height:200px;
}
.box{
    background-color: blue;
    padding: 10px;
    width: 100px;
    height:100px;
    border: 5px solid green;
}