body {
    font-family: sans-serif;
    background: #f5f5f5;
}

.container {
    max-width: 600px;
    margin: 50px auto;
    background: white;
    padding: 30px;
    border-radius: 10px;
}

.question {
    margin-bottom: 20px;
}

button {
    padding: 10px 20px;
    cursor: pointer;
}

.hidden {
    display: none;
}

footer {
    margin-top: 40px;
    font-size: 12px;
    color: #888;
}