body {
    background: #121212;
    color: #b0b0b0;
    font-family: monospace;
    font-size: 12px;
}

#main {
    margin: 10px;
}

button {
    background: #222;
    color: #ccc;
    border: 1px solid #555;
    cursor: pointer;
    padding: 3px 8px;
}

button:hover {
    background: #444;
    color: #fff;
}

button:disabled {
    border-color: #333;
    color: #555;
    background: #1a1a1a;
    cursor: not-allowed;
}