HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS backdrop-filter Glass Card Example</title>
  <style>
    body {
      margin: 0;
      min-height: 100vh;
      display: grid;
      place-items: center;
      background:
        radial-gradient(circle at top left, #38bdf8, transparent 55%),
        radial-gradient(circle at bottom right, #a855f7, transparent 50%),
        #0f172a;
      font-family: sans-serif;
    }
    .glass-card {
      width: min(90%, 360px);
      padding: 1.25rem 1.5rem;
      border-radius: 1rem;
      background: rgba(255, 255, 255, 0.12);
      border: 1px solid rgba(255, 255, 255, 0.25);
      backdrop-filter: blur(12px) saturate(160%);
      color: #fff;
      box-shadow: 0 20px 40px rgba(15, 23, 42, 0.25);
    }
  </style>
</head>
<body>
  <article class="glass-card">
    <h1>Glass Card</h1>
    <p>This card blurs and brightens the backdrop behind it.</p>
  </article>
</body>
</html>

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CSS backdrop-filter Property - Glass Card