HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS background-attachment Local Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f1f5f9;
    }
    .notes {
      max-width: 360px;
      max-height: 180px;
      overflow: auto;
      padding: 1rem;
      border-radius: 0.75rem;
      border: 1px solid #cbd5e1;
      background-image: linear-gradient(180deg, #dbeafe, #ede9fe);
      background-attachment: local;
      background-size: 100% 120px;
    }
    .notes p { margin: 0 0 1rem; }
  </style>
</head>
<body>
  <h1>Local Background in a Scroll Box</h1>
  <div class="notes">
    <p>Line 1 — background starts here.</p>
    <p>Line 2 — scroll inside this box.</p>
    <p>Line 3 — the background moves with the text.</p>
    <p>Line 4 — useful for note panels and chat areas.</p>
    <p>Line 5 — end of content.</p>
  </div>
</body>
</html>

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CSS background-attachment Property - Local Scroll Box