HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS opacity Overlay Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 2rem;
    }
    .card {
      position: relative;
      width: 320px;
      height: 180px;
      border-radius: 0.75rem;
      overflow: hidden;
      background: linear-gradient(135deg, #60a5fa, #a78bfa);
    }
    .overlay {
      position: absolute;
      inset: 0;
      background: #0f172a;
      opacity: 0.6;
    }
    .content {
      position: relative;
      padding: 1.25rem;
      color: #fff;
      font-weight: 600;
    }
  </style>
</head>
<body>
  <h1>Overlay with opacity: 0.6</h1>
  <div class="card">
    <div class="overlay"></div>
    <div class="content">Content behind the overlay</div>
  </div>
</body>
</html>

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CSS opacity Property - Overlay Backdrop