HTML Code

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

    .cta {
      padding: 0.65rem 1.25rem;
      border: none;
      border-radius: 0.4rem;
      background: #dc2626;
      color: #fff;
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
    }

    @media (color-gamut: p3) {
      .cta {
        background: color(display-p3 1 0.15 0.1);
      }
    }
  </style>
</head>
<body>
  <h1>Hero CTA</h1>
  <button class="cta">Get Started</button>
  <p>More saturated red on P3 displays.</p>
</body>
</html>

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CSS color-gamut - P3 CTA Button