HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>background-repeat: repeat-y</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-color: #eff6ff;
      background-image: radial-gradient(circle, #2563eb 0 8px, transparent 9px);
      background-size: 40px 40px;
      background-position: center;
      background-repeat: repeat-y;
    }
  </style>
</head>
<body>
  <p><strong>background-repeat: repeat-y</strong> tiles top to bottom only. The horizontal axis stays one column.</p>
  <div></div>
</body>
</html>

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CSS background-repeat Property — repeat-y