HTML Code

<!DOCTYPE html>

<html>

<head>

  <title>CSS background-color RGBA Example</title>

  <style>

    body {

      margin: 0;

      font-family: sans-serif;

    }

    .hero {

      min-height: 100vh;

      display: grid;

      place-items: center;

      padding: 1.5rem;

      background-image: linear-gradient(135deg, #0f766e, #2563eb);

    }

    .overlay {

      max-width: 24rem;

      padding: 1.25rem;

      border-radius: 0.85rem;

      color: #fff;

      background-color: rgba(15, 23, 42, 0.55);

      backdrop-filter: blur(2px);

    }

  </style>

</head>

<body>

  <section class="hero">

    <div class="overlay">

      <h1>Semi-transparent panel</h1>

      <p>Uses <code>background-color: rgba(15, 23, 42, 0.55);</code> so the gradient still shows through.</p>

    </div>

  </section>

</body>

</html>

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CSS background-color Property - RGBA Transparency