HTML Code

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

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

    .scene {
      padding: 24px;
      background: linear-gradient(135deg, #2563eb, #db2777);
    }

    .panel {
      padding: 16px;
      background: rgb(255 255 255 / 0.35);
      backdrop-filter: blur(8px);
      color: #0f172a;
      text-align: center;
      font-weight: 700;
    }
  </style>
</head>
<body>
  <p>The gradient is the backdrop. <strong>backdrop-filter: blur(8px)</strong> softens only what shows through the translucent panel.</p>
  <div class="scene">
    <div class="panel">Blurred backdrop</div>
  </div>
</body>
</html>

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CSS backdrop-filter Property — blur