HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>@media (min-monochrome: 2)</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0;
      max-width: 40rem;
      line-height: 1.5;
      padding: 12px;
      border: 1px solid #94a3b8;
      color: #334155;
    }

    @media (min-monochrome: 2) {
      p {
        border-width: 3px;
        border-color: #000;
      }
    }
  </style>
</head>
<body>
  <p><strong>(min-monochrome: 2)</strong> — thicker border when grayscale depth is at least 2 bpp.</p>
</body>
</html>

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CSS monochrome Media Feature — min-monochrome