HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>WhatsApp Messenger</title>
<link rel="stylesheet" href="styles.css">
</head>
<body>
<header>
<h1>WhatsApp</h1>
</header>
<main>
<div class="chat-list">
<h2>Chats</h2>
<ul id="chatItems">
<li class="chat-item">Chat 1</li>
<li class="chat-item">Chat 2</li>
<li class="chat-item">Chat 3</li>
</ul>
</div>
<div class="chat-window">
<h2>Chat with User</h2>
<div id="messages">
<p>User: Hello!</p>
<p>You: Hi there!</p>
</div>
<input type="text" id="messageInput" placeholder="Type a message..." />
<button id="sendButton">Send</button>
</div>
</main>
<script src="script.js"></script>
</body>
</html>