console 命令行工具 X clear

console

<body>
	<div class="theme"></div>
    <div></div>
    <div></div>
    <div></div>
    
</body>

body{
    width: 750px;
    background: rgb(103, 170, 233);
}
.theme{
    width: 690px;
    height: 401.5px;
    background: #FFFFFF;
    margin:50px 30px 30px 20px; 
}