HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>background-origin: border-box</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 {
      padding: 24px;
      border: 12px dashed #64748b;
      background-color: #f1f5f9;
      background-image: radial-gradient(circle, #2563eb 0 28px, transparent 29px);
      background-repeat: no-repeat;
      background-size: 64px 64px;
      background-position: left top;
      background-origin: border-box;
    }
  </style>
</head>
<body>
  <p>With <strong>border-box</strong>, the circle starts at the outer border edge and can sit under the dashes.</p>
  <div>Content area</div>
</body>
</html>

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CSS background-origin Property — border-box