HTML Code

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

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

    section {
      background-color: #fde68a;
      padding: 16px;
    }

    div {
      background-color: rgb(37 99 235 / 0.5);
      padding: 16px;
    }
  </style>
</head>
<body>
  <p><strong>background-color: rgb(37 99 235 / 0.5)</strong> is half-transparent blue. The yellow parent shows through. Only the fill fades — not the text.</p>
  <section>
    <div>Half-blue over yellow</div>
  </section>
</body>
</html>

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CSS background-color Property — rgb with alpha