body {
 font-family: Arial, sans-serif;
 margin: 0;
 padding: 0;
 background-color: #f5f5f5;
}

header {
 background-color: #4CAF50;
 color: #fff;
 padding: 10px 20px;
}

.chat {
 padding: 20px;
}

.chat-history {
 border: 1px solid #ccc;
 padding: 10px;
 margin-bottom: 10px;
}

#messageInput {
 width: 100%;
 padding: 10px;
 margin-bottom: 10px;
}

button {
 padding: 10px 20px;
 background-color: #4CAF50;
 color: #fff;
 border: none;
 cursor: pointer;
}

button:hover {
 background-color: #444;
}