HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS monochrome Buttons Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 2rem;
      margin: 0;
    }

    .btn {
      padding: 0.65rem 1.25rem;
      border: none;
      border-radius: 0.45rem;
      font-weight: 600;
      cursor: pointer;
      margin-right: 0.5rem;
    }

    .btn-primary { background: #2563eb; color: #fff; }
    .btn-secondary { background: #dc2626; color: #fff; }

    @media (monochrome) {
      .btn {
        background: #fff;
        color: #000;
        border: 2px solid #000;
      }
      .btn-primary {
        background: #000;
        color: #fff;
      }
    }
  </style>
</head>
<body>
  <h1>Actions</h1>
  <button type="button" class="btn btn-primary">Save</button>
  <button type="button" class="btn btn-secondary">Cancel</button>
</body>
</html>

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CSS monochrome - High-Contrast Buttons