body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    color: #333;
    background-color: #f4f4f4;
}

header {
    background: #007BFF;
    color: #fff;
    padding: 10px 20px;
    text-align: center;
}

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

nav ul li {
    display: inline;
    margin: 0 15px;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
}

main {
    padding: 20px;
}

footer {
    text-align: center;
    background: #007BFF;
    color: #fff;
    padding: 10px 0;
    position: relative;
    bottom: 0;
    width: 100%;
}

@media (max-width: 600px) {
    header {
        font-size: 1.5em;
    }

    nav ul li {
        display: block;
        margin: 5px 0;
    }
}

#quiz {
    margin: 20px 0;
}

.option {
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 5px;
    padding: 10px;
    margin: 10px 0;
    cursor: pointer;
}

.option:hover {
    background: #f0f0f0;
}