HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>block-end snap spacing</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 20px;
      background: #f1f5f9;
    }

    .smbe-box {
      height: 280px;
      overflow-y: auto;
      scroll-snap-type: y mandatory;
      scroll-behavior: smooth;
      border: 2px solid #94a3b8;
      border-radius: 12px;
      background: #fff;
      padding: 8px;
    }

    .smbe-panel {
      height: 200px;
      scroll-snap-align: start;
      margin-bottom: 12px;
      border-radius: 10px;
      display: grid;
      place-items: center;
      font-weight: 700;
      color: #0f172a;
    }

    .smbe-panel:last-child {
      scroll-margin-block-end: 24px;
      background: #bbf7d0;
    }
  </style>
</head>
<body>
  <h1>Last panel block-end offset</h1>
  <p>Scroll to the last panel. <code>scroll-margin-block-end: 24px</code> adds space below it when snapped.</p>
  <div class="smbe-box">
    <div class="smbe-panel" style="background:#fecaca;">Panel 1</div>
    <div class="smbe-panel" style="background:#bfdbfe;">Panel 2</div>
    <div class="smbe-panel">Panel 3</div>
  </div>
</body>
</html>

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Bottom breathing room on the last snap panel