HTML Code

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

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

    div {
      height: 180px;
      border: 2px dashed #334155;
      background: linear-gradient(135deg, #2563eb, #7c3aed);
      mask-image: radial-gradient(circle, #000 0 28px, transparent 29px);
      mask-repeat: no-repeat;
      mask-size: 72px 72px;
      mask-position: 20px 30px;
    }
  </style>
</head>
<body>
  <p><strong>mask-position: 20px 30px</strong> places the mask 20px from the left and 30px from the top.</p>
  <div></div>
</body>
</html>

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CSS mask-position Property — lengths