body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f9;
    color: #333;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    margin-top: 20px;
}

h1 {
    color: #333;
    text-align: center;
}

.button {
    display: inline-block;
    padding: 10px 20px;
    background-color: #007BFF;
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
    margin-top: 20px;
}

.button:hover {
    background-color: #0056b3;
}

.question {
    margin-bottom: 20px;
}

.answer-option {
    margin: 10px 0;
}

.chart-container {
    width: 100%;
    height: 400px;
    margin: 20px 0;
}

.feedback {
    margin-top: 20px;
    padding: 15px;
    border-radius: 5px;
    background-color: #f8f9fa;
    border: 1px solid #ddd;
}

.feedback h3 {
    color: #28a745;
    font-size: 1.2em;
}

.feedback h3.incorrect {
    color: #dc3545;
}