body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f0f0f0;
    margin: 0;
}

.quiz-container {
    background-color: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    width: 300px;
    text-align: center;
}

h1 {
    font-size: 24px;
    margin-bottom: 20px;
}

button {
    display: block;
    width: 100%;
    padding: 10px;
    margin: 5px 0;
    border: none;
    border-radius: 5px;
    background-color: #3498db;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
}

button:hover {
    background-color: #2980b9;
}

.hidden {
    display: none;
}