HTML Code

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

    p {
      margin: 0;
      padding: 8px;
      background: #f1f5f9;
      font-size: 1.125rem;
      line-height: 1.5;
    }

    @media (color-index: 0) {
      p {
        background: #dbeafe;
        border: 1px solid #2563eb;
      }
    }
  </style>
</head>
<body>
  <p>Blue panel on non-indexed (true-color) devices.</p>
</body>
</html>

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CSS color-index Media Feature — color-index: 0