#chat-container {
    width: 300px;
    height: 400px;
    border: 1px solid #ddd;
    margin: auto;
    padding: 10px;
}

#chat-box {
    height: 350px;
    overflow: auto;
    margin-bottom: 10px;
}

#user-input {
    width: calc(100% - 60px);
}