HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS row-gap Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 24px;
      background: #f8fafc;
    }

    .rg-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      row-gap: 20px;
      column-gap: 12px;
      max-width: 420px;
    }

    .rg-item {
      background: #22c55e;
      padding: 20px;
      text-align: center;
      color: #fff;
      font-weight: 600;
      border-radius: 8px;
    }
  </style>
</head>
<body>
  <h1>Grid Layout with Custom Row Gap</h1>
  <div class="rg-grid">
    <div class="rg-item">Item 1</div>
    <div class="rg-item">Item 2</div>
    <div class="rg-item">Item 3</div>
    <div class="rg-item">Item 4</div>
  </div>
</body>
</html>

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Grid layout with row-gap: 20px