body {
    background-color: #1a1a1a;
    color: #00ff99;
    font-family: Tahoma, sans-serif;
}
.container, .chat-box, .user-box, .message-box {
    background-color: #2b2b2b;
    border: 2px solid #555;
    padding: 10px;
    border-radius: 5px;
}
input[type="text"], input[type="password"], textarea {
    background-color: #111;
    color: #00ff99;
    border: 1px solid #666;
}
button, input[type="submit"] {
    background-color: #444;
    border: 1px solid #00ff99;
    color: #00ff99;
    font-weight: bold;
}
a, a:hover {
    color: #00ffff;
}