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 border-width Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
    }

    .box {
      max-width: 16rem;
      border-style: solid;
      border-width: 5px;
      border-color: #ff5733;
      padding: 10px;
    }
  </style>
</head>
<body>
  <h1>Box with Custom Border Width</h1>
  <div class="box">This box has a 5px wide border.</div>
</body>
</html>

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CSS border-width Property - Box with Custom Border Width