body {
    font-family: Arial, sans-serif;
    background-color: #f0f2f5;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.quiz-container {
    background: #fff;
    width: 90%;
    max-width: 600px;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

#question {
    font-size: 1.5rem;
    color: #333;
    margin-bottom: 25px;
}

.option {
    display: block;
    background: #f9f9f9;
    border: 1px solid #ddd;
    padding: 12px;
    margin-bottom: 10px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.option:hover {
    background: #f1f1f1;
}

.option input {
    margin-right: 10px;
}

#submit-btn {
    display: block;
    width: 100%;
    padding: 12px;
    background-color: #2ecc71;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    margin-top: 20px;
    transition: background-color 0.3s;
}

#submit-btn:hover {
    background-color: #27ae60;
}

#result {
    margin-top: 20px;
    font-size: 1.2rem;
    font-weight: bold;
    text-align: center;
}

.option.correct {
    background-color: #d4edda;
    border-color: #c3e6cb;
}

.option.incorrect {
    background-color: #f8d7da;
    border-color: #f5c6cb;
}