lovecoding
/
Web1020


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body{
            margin:0;
        }
        .box{
            width: 100%;
            height: 200px;
            background-color: red;
            float: left;

        }
        .box2{
            width: 400px;
            height: 200px;
            background-color: blue;
            float: left;
            margin-left: -100%;
        }
    </style>
</head>
<body>
    <div class="box"></div>
    <div class="box2"></div>
</body>
</html>