public/styles.css

.chat-container {
    width: 400px;
    margin: 20px auto;
    padding: 20px;
    border: 1px solid #ccc;
    border-radius: 5px;
}
#chat-window {
    height: 300px;
    overflow-y: scroll;
    border: 1px solid #eee;
    padding: 10px;
    margin-bottom: 10px;
}
.message {
    margin: 5px 0;
}
.user {
    text-align: right;
    color: blue;
}
.assistant {
    text-align: left;
    color: green;
}