HTML Code

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

    .snap-box {
      width: 320px;
      height: 220px;
      overflow: auto;
      scroll-snap-type: y mandatory;
      scroll-behavior: smooth;
      scroll-padding-block-start: 24px;
      border: 2px solid #2563eb;
      border-radius: 12px;
      background: #fff;
      padding: 8px;
    }

    .panel {
      scroll-snap-align: start;
      height: 150px;
      margin-bottom: 20px;
      background: #dbeafe;
      border: 2px solid #2563eb;
      border-radius: 10px;
      display: grid;
      place-items: center;
      font-weight: 700;
      color: #1e3a8a;
    }
  </style>
</head>
<body>
  <h1>Snap Scroller Block-Start Inset</h1>
  <p>Scroll to the first panel. <code>scroll-padding-block-start: 24px</code> insets the scrollport top.</p>
  <div class="snap-box">
    <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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Snap scroller block-start inset