lovecoding
/
W260426


			
				
					
						
						
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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>
        .box {
            /* width: 600px; */
            max-width: 600px;
            margin: 100px auto;
        }

        .box img {
            width: 100%;
        }

        .box2 {
            max-width: 600px;
            margin: 0 auto;

        }

        .box3 {
            background-image: url(./img/img1.jpg);
            background-size: cover;
            width: 100%;
            /* padding 使用百分比 相较于父元素的宽度 */
            padding-top:62.5%;
        }
    </style>
</head>

<body>
    <div class="box">
        <img src="./img/img1.jpg" alt="">
    </div>
    <div class="box2">
        <div class="box3"></div>
    </div>
</body>

</html>