#chat-app {
    display: flex;
    height: 500px;
    border: 1px solid #ddd;
}

#sidebar {
    width: 220px;
    border-right: 1px solid #ddd;
    padding: 10px;
}

.chat-item {
    padding: 8px;
    cursor: pointer;
    border-bottom: 1px solid #eee;
}

#chatbox {
    flex: 1;
    display: flex;
    flex-direction: column;
}

#messages {
    flex: 1;
    overflow-y: auto;
    padding: 10px;
}

.message {
    margin: 6px 0;
    padding: 8px;
    border-radius: 6px;
    max-width: 80%;
}

.user {
    background: #007bff;
    color: #fff;
    margin-left: auto;
}

.bot {
    background: #f1f1f1;
}