body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: #f5f5f5;
}

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

h1 {
    font-size: 32px;
    margin-top: 0;
    margin-bottom: 20px;
}

ul {
    list-style: none;
    padding: 0;
}

li {
    margin-bottom: 10px;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    cursor: pointer;
}

li:hover {
    background-color: #f5f5f5;
}

.answer {
    margin-left: 20px;
    display: none;
}

.active {
    background-color: #f5f5f5;
}

.show {
    display: block;
}