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css实现未知宽度的正方形【自适应宽度正方形】

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        body{text-align:center;}
       *{
                margin:0;
                padding:0;
        }
        .box{
                display:inline-block;
                margin: 1% auto;
                width: 30%;
                background: #ff6600;
        }
        .box:after{
                display: block;
                padding-top: 100%;
                content : '';
        }
    </style>
</head>
<body>
    <div class="box">ddfgdfgdf</div>
    
</body>
</html>      

转载于:https://www.cnblogs.com/shimily/articles/4452432.html