HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>overscroll-behavior-block: contain</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      min-height: 160vh;
      color: #0f172a;
    }

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

    .panel {
      height: 140px;
      overflow: auto;
      overscroll-behavior-block: contain;
      box-sizing: border-box;
      padding: 12px;
      border: 2px dashed #334155;
      background: #f8fafc;
    }

    .panel p {
      margin: 0 0 10px;
    }
  </style>
</head>
<body>
  <p>Scroll the dashed box to the top or bottom, then keep scrolling. <strong>overscroll-behavior-block: contain</strong> keeps that extra scroll inside the panel.</p>
  <div class="panel">
    <p>Line 1 — scroll inside this box.</p>
    <p>Line 2 — keep going to the edge.</p>
    <p>Line 3 — extra scroll stays here.</p>
    <p>Line 4 — the page behind should not move.</p>
    <p>Line 5 — end of the panel content.</p>
  </div>
</body>
</html>

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CSS overscroll-behavior-block Property — contain