HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>border: double</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    div {
      border: 6px double #0f766e;
      padding: 12px;
    }
  </style>
</head>
<body>
  <p><strong>double</strong> needs enough width for two lines and the gap between them.</p>
  <div>Double border</div>
</body>
</html>

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CSS border Property — double