body {
            font-family: Arial, sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            margin: 0;
            background-color: white;
        }

        .quiz-container {
            background: rgb(239, 235, 235);
            padding: 2rem;
            border-radius: 10px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
            max-width: 600px;
            width: 100%;
            text-align: center;
        }

        h1 {
            color: black;
            margin-bottom: 1.5rem;
        }

        .question {
            font-size: 1.2rem;
            margin-bottom: 1.5rem;
            color: gray;
        }

        .options {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }

        button {
            padding: 0.75rem;
            font-size: 1rem;
            border: none;
            border-radius: 5px;
            background-color: rgb(80, 179, 255);
            color: white;
            cursor: pointer;
            transition: background-color 0.3s;
        }

        button:hover {
            background-color: rgb(0, 102, 153);
        }

        button:disabled {
            background-color: red;
            cursor: not-allowed;
        }

        .result {
            font-size: 1.2rem;
            margin-top: 1.5rem;
            color: gray;
        }

        .restart-btn {
            margin-top: 1rem;
            background-color: green;
        }

        .restart-btn:hover {
            background-color: darkgreen;
        }

        @media (max-width: 500px) {
            .quiz-container {
                padding: 1rem;
            }

            h1 {
                font-size: 1.5rem;
            }

            .question {
                font-size: 1rem;
            }

            button {
                font-size: 0.9rem;
                padding: 0.5rem;
            }
        }