HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>scroll-margin-top: 0</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    .scroller {
      display: flex;
      flex-direction: column;
      width: 270px;
      height: 250px;
      overflow-y: auto;
      scroll-snap-type: y mandatory;
      border: 1px solid #334155;
    }

    .panel {
      flex: 0 0 250px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2rem;
      font-weight: 700;
      color: #fff;
      background: #5b21b6;
      scroll-snap-align: start;
    }

    .panel:nth-child(even) {
      background: #ddd6fe;
      color: #5b21b6;
    }

    .target {
      scroll-margin-top: 0;
    }
  </style>
</head>
<body>
  <p><strong>scroll-margin-top: 0</strong> means no top outset. Panel 2 snaps flush.</p>
  <div class="scroller">
    <div class="panel">1</div>
    <div class="panel target">2</div>
    <div class="panel">3</div>
  </div>
</body>
</html>

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CSS scroll-margin-top Property — 0