用户自定义元素大小的计算方式（box-sizing)

- 作者：霏梦

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>用户自定义元素大小的计算方式</title>
    <style>
      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }
      .box {
        width: 200px;
        height: 180px;
        border: 6px solid black;
        padding: 10px;
        background-color: violet;
        background-clip: content-box;
        /* 重新计算大小，默认是以content-box为准 */
        box-sizing: border-box;
      }
      .box2 {
        width: 80px;
        height: 120px;
        background-color: red;
        padding: 20px;
      }
    </style>
  </head>
  <body>
    <div class="box">
      <div class="box2"></div>
    </div>
  </body>
</html>

- 作者：霏梦

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