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 Global Reset</title>
  <style>
    *,
    *::before,
    *::after {
      box-sizing: border-box;
    }

    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
    }

    .row {
      display: flex;
      gap: 0.5rem;
      max-width: 24rem;
    }

    .col {
      width: 50%;
      padding: 1rem;
      border: 2px solid #2563eb;
      background: #dbeafe;
    }
  </style>
</head>
<body>
  <h1>Global border-box reset</h1>
  <p>Both columns are width: 50% with padding and border — they fit on one row.</p>
  <div class="row">
    <div class="col">Col 1</div>
    <div class="col">Col 2</div>
  </div>
</body>
</html>

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CSS box-sizing Property - Global border-box Reset