HTML Code

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

    .panel-scroller {
      height: 320px;
      overflow-y: scroll;
      scroll-snap-type: y mandatory;
      border: 2px solid #2563eb;
      border-radius: 12px;
      background: #fff;
    }

    .panel {
      height: 100%;
      scroll-snap-align: start;
      display: grid;
      place-items: center;
      font-size: 1.5rem;
      font-weight: 700;
      color: #1e3a8a;
    }

    .panel:nth-child(1) { background: #dbeafe; }
    .panel:nth-child(2) { background: #bfdbfe; }
    .panel:nth-child(3) { background: #93c5fd; }
  </style>
</head>
<body>
  <h1>Vertical Snap Panels</h1>
  <p>Scroll vertically with <code>scroll-snap-type: y mandatory</code>.</p>
  <div class="panel-scroller">
    <div class="panel">Panel 1</div>
    <div class="panel">Panel 2</div>
    <div class="panel">Panel 3</div>
  </div>
</body>
</html>

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Vertical panel scroller with y mandatory