HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS box-sizing Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
      line-height: 1.5;
    }

    .box-content {
      box-sizing: content-box;
      width: 200px;
      padding: 20px;
      border: 5px solid black;
      background: #dbeafe;
      margin-bottom: 1rem;
    }

    .box-border {
      box-sizing: border-box;
      width: 200px;
      padding: 20px;
      border: 5px solid black;
      background: #bbf7d0;
    }
  </style>
</head>
<body>
  <h1>Box-Sizing Property Example</h1>
  <div class="box-content">
    Content-box: Width is 200px, plus padding and border.
  </div>
  <div class="box-border">
    Border-box: Total width is 200px, including padding and border.
  </div>
</body>
</html>

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CSS box-sizing Property - content-box vs border-box