console 命令行工具 X clear

console

<div class="parent">
    <div class="child"></div>
</div>

.parent {
    width: 600px;
    height: 600px;
    background: green;
    display: flex;
    justify-content: center;
    align-items: center
}
.child {
    width: 60px;
    height: 60px;
    background: yellow;
}