HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>box-sizing compare</title>
  <style>
    .box {
      width: 160px;
      padding: 20px;
      border: 8px solid #1d4ed8;
      background: #93c5fd;
      margin-bottom: 12px;
    }

    .a { box-sizing: content-box; }
    .b { box-sizing: border-box; }
  </style>
</head>
<body>
  <div class="box a">content-box</div>
  <div class="box b">border-box</div>
</body>
</html>

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CSS box-sizing Property — compare