console 命令行工具 X clear

console

<div id="wrapper">

</div>

#wrapper {
    background-color: pink;
    width: 200px;/*随意px或%*/
    height: 200px;/*随意px或%*/
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    margin: auto;
}