body {
    font-family: Arial, sans-serif;
    background-color: #f0f8ff;
    color: #333;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    text-align: center;
    background-color: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    width: 80%;
    max-width: 600px;
}

h1 {
    color: #4caf50;
    font-size: 24px;
}

h2.subtitle {
    color: #ff5722;
    font-size: 20px;
}

.button {
    background-color: #2196f3;
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: 16px;
    border-radius: 5px;
    cursor: pointer;
    margin: 10px 0;
}

.button:hover {
    background-color: #0b7dda;
}

.hidden {
    display: none;
}

.choice {
    background-color: #f1f1f1;
    border: 2px solid #ddd;
    padding: 10px;
    margin: 10px 0;
    border-radius: 5px;
    cursor: pointer;
}

.choice:hover {
    background-color: #ddd;
}

.correct {
    color: blue;
}

.incorrect {
    color: red;
}

.quote {
    font-style: italic;
    color: #555;
}