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

    .card {
      max-width: 18rem;
      border: 1px solid #cbd5e1;
      border-right-width: 6px;
      border-right-color: #2563eb;
      padding: 1rem;
      border-radius: 0.5rem;
      background: #fff;
    }
  </style>
</head>
<body>
  <h1>Thick Right Accent</h1>
  <div class="card">Thick right accent</div>
</body>
</html>

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CSS border-right-width Property - Thick Right Accent