css背景图撑开盒子高度

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>背景图撑开盒子高度</title>
    <style>
        .bg-box {
            background-image: url(../demo.jpg);
            background-size: 100% 100%;
            background-repeat: no-repeat;
            margin:0 auto;
        }
        .bg-box::after {
            content: "";
            display: block;
            /*这里的padding =  height / width*/
            padding:20%;
        }
    </style>
</head>
<body>
    <div class="bg-box"></div>
</body>
</html>
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原文地址：https://www.cnblogs.com/yesyes/p/6952249.html