body {
            background-color: #0a0f0f;
            color: #ffffff;
            font-family: 'Courier New', monospace;
        }
        .quiz-container {
            background-color: #1a1f1f;
            border: 2px solid #2f3f3f;
            box-shadow: 0 0 20px rgba(0, 255, 255, 0.1);
        }
        .answer-btn {
            transition: all 0.3s ease;
            font-family: 'Courier New', monospace;
        }
        .answer-btn:hover {
            background-color: #2f3f3f;
            transform: scale(1.02);
        }
        .correct {
            background-color: #1a472a !important;
        }
        .wrong {
            background-color: #4a1f1f !important;
        }
        .progress-bar {
            height: 10px;
            background-color: #2f3f3f;
            border-radius: 5px;
            overflow: hidden;
        }
        .progress-fill {
            height: 100%;
            background-color: #00ffff;
            opacity: 0.3;
            transition: width 0.5s ease;
        }
        .lab-effect {
            text-shadow: 0 0 10px rgba(0, 255, 255, 0.5);
        }
        .classified {
            font-family: 'Courier New', monospace;
            letter-spacing: 2px;
        }