HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Both-axis scroll-snap-type grid</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 20px;
      background: #f8fafc;
    }

    .snap-grid {
      display: grid;
      grid-template-columns: repeat(3, 160px);
      grid-auto-rows: 120px;
      gap: 12px;
      width: 340px;
      height: 280px;
      overflow: auto;
      scroll-snap-type: both mandatory;
      padding: 12px;
      border: 2px solid #7c3aed;
      border-radius: 12px;
      background: #fff;
    }

    .tile {
      scroll-snap-align: start;
      background: #ede9fe;
      border: 2px solid #7c3aed;
      border-radius: 10px;
      display: grid;
      place-items: center;
      font-weight: 700;
      color: #5b21b6;
    }
  </style>
</head>
<body>
  <h1>Both-Axis Snap Grid</h1>
  <p>Scroll in both directions with <code>scroll-snap-type: both mandatory</code>.</p>
  <div class="snap-grid">
    <div class="tile">1</div>
    <div class="tile">2</div>
    <div class="tile">3</div>
    <div class="tile">4</div>
    <div class="tile">5</div>
    <div class="tile">6</div>
    <div class="tile">7</div>
    <div class="tile">8</div>
    <div class="tile">9</div>
  </div>
</body>
</html>

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Grid gallery with both mandatory