lovecoding
/
W250511


			
				
					
						
						
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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>
        *{
            margin: 0;
            padding: 0;
        }
        .box1{
            /* width: 100%;
            height: 100%; */
            /* position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0; */

            width: 100vw;
            height: 100vh;
            background-color: red; 
        }
    </style>
</head>
<body>
    <div class="box1">
        
    </div>
</body>
</html>