console 命令行工具 X clear

console

<div class="f">
    <div class="c"></div>
</div>

.f {
    width: 100px;
    height: 100px;
    border: 1px solid green;
    padding: 5px;
    position: relative;
}

.c {
    position: absolute;
    border: 1px solid red;
    width: auto;
}