HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>CSS overscroll-behavior Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 2rem;
      min-height: 150vh;
    }
    .scroll-container {
      width: 300px;
      height: 150px;
      overflow: auto;
      border: 1px solid #ccc;
      overscroll-behavior: contain;
    }
    .content {
      height: 300px;
      background: linear-gradient(to bottom, #f06, #f9a);
    }
    p {
      line-height: 1.55;
      color: #334155;
    }
  </style>
</head>
<body>
  <h1>Overscroll Behavior Example</h1>
  <p>Scroll inside the box to the top or bottom, then keep scrolling. The page behind should not scroll because of <code>overscroll-behavior: contain</code>.</p>
  <div class="scroll-container">
    <div class="content"></div>
  </div>
</body>
</html>

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CSS overscroll-behavior Property - contain