纯CSS实现Div高度根据自适应宽度（百分百调整）

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>纯CSS实现Div高度根据自适应宽度（百分百调整）</title>

    </head>
    <style>
        .father {
            width: 100px;
            height: 100px;
            background: #222
        }
        
        .element {
            width: 50%;
            height: 0;
            padding-bottom: 50%;
            background: #eee;
        }
    </style>

    <body>
        <div class="father">
            <div class="element">
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            </div>
        </div>
    </body>

</html>

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