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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{
- max-width: 800px;
- background-color: red;
- /* padding 的100% 是相对于自身的宽度 */
- padding-top: 50%;
- }
- </style>
- </head>
- <body>
- <div class="box"></div>
- </body>
- </html>
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