HTML Code

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

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

    section {
      position: relative;
      background: #93c5fd;
      padding: 24px;
    }

    .overlay {
      position: absolute;
      inset: 0;
      background: #0f172a;
      opacity: 0.6;
    }

    section > p {
      position: relative;
      color: #fff;
      margin: 0;
      font-weight: 700;
    }
  </style>
</head>
<body>
  <p class="note">The dark layer uses <strong>opacity: 0.6</strong>. The text sits above it with <code>position: relative</code>.</p>
  <section>
    <div class="overlay"></div>
    <p>Content over the dim layer</p>
  </section>
</body>
</html>

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CSS opacity Property — Dim Overlay