body {
    background: #111;
    color: #eee;
    font-family: Orbitron, sans-serif;
    text-align: center;
}

.center {
    margin-top: 10%;
}

.button {
    padding: 10px 20px;
    background: #444;
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
}

input {
    padding: 10px;
    margin: 10px;
    width: 250px;
}

.chat-box {
    width: 60%;
    margin: 20px auto;
    background: #222;
    padding: 20px;
    border-radius: 10px;
    text-align: left;
}

.user-msg {
    color: #6cf;
    margin-bottom: 10px;
}

.ai-msg {
    color: #fc6;
    margin-bottom: 10px;
}

.error {
    color: red;
}