HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>CSS overflow-y Chat Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 2rem;
      background: #f1f5f9;
    }
    .chat {
      width: 320px;
      border: 1px solid #cbd5e1;
      border-radius: 0.75rem;
      background: #fff;
      overflow: hidden;
    }
    .chat-header {
      padding: 0.75rem 1rem;
      font-weight: 700;
      border-bottom: 1px solid #e2e8f0;
      background: #f8fafc;
    }
    .chat-messages {
      height: 200px;
      overflow-y: auto;
      padding: 0.75rem 1rem;
      display: flex;
      flex-direction: column;
      gap: 0.65rem;
    }
    .message {
      max-width: 85%;
      padding: 0.5rem 0.75rem;
      border-radius: 0.65rem;
      font-size: 0.9rem;
      line-height: 1.45;
    }
    .message--in {
      align-self: flex-start;
      background: #e2e8f0;
      color: #1e293b;
    }
    .message--out {
      align-self: flex-end;
      background: #2563eb;
      color: #fff;
    }
  </style>
</head>
<body>
  <h1>Chat with overflow-y: auto</h1>
  <div class="chat">
    <div class="chat-header">Team Chat</div>
    <div class="chat-messages">
      <div class="message message--in">Hey, can you review the modal layout?</div>
      <div class="message message--out">Sure — I will check the scroll area today.</div>
      <div class="message message--in">The message list should stay inside a fixed height.</div>
      <div class="message message--out">overflow-y auto on the list container should work.</div>
      <div class="message message--in">Perfect. Scroll only when messages exceed the box.</div>
      <div class="message message--out">Exactly. That keeps the page layout stable.</div>
    </div>
  </div>
</body>
</html>

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CSS overflow-y Property - Chat List