body {
    font-family: Arial, sans-serif;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}
.chat-container {
    border: 1px solid #ddd;
    padding: 20px;
    border-radius: 8px;
}
#messages {
    min-height: 200px;
    margin-bottom: 10px;
}