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>
        .box1{
            width: 400px;
            height: 400px;
            border:1px solid black

        }
        .box2{
            width: 100%;
            height: 200px;
            background-color: red;
            /* padding:20px; */
        }
        body{
            margin: 0;
        }
        .box3{
            /* width: 100%; */
            background-color: red;
            /* vh\vw 会把整个视口分为100份 */
            /*width: 100vw; /* 视口宽度  viewport width*/
            height: 100vh; /* 视口高度 viewport height*/
            margin-left: 100px;
            /* width: calc(100vw - 100px); */
            width: calc(100% - 100px); 
            
        }
    </style>
</head>
<body>
    <!-- <div class="box1">
        <div class="box2">hello</div>
    </div> -->

    <div class="box3"></div>
</body>
</html>