HTML Code

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

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

    .box {
      filter: drop-shadow(6px 6px 4px rgba(0, 0, 0, 0.45));
      width: 10rem;
      padding: 24px;
      text-align: center;
      font-weight: 700;
      color: #fff;
      background: linear-gradient(135deg, #ef4444, #3b82f6);
      border: 3px solid #fbbf24;
    }
  </style>
</head>
<body>
  <p><strong>drop-shadow()</strong> follows the element's alpha outline.</p>
  <div class="box">Shadow</div>
</body>
</html>

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CSS filter Property — drop-shadow