body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}
header {
    background-color: #222;
    color: white;
    padding: 1em;
}
header nav ul {
    list-style: none;
    display: flex;
    gap: 1em;
}
header nav ul li a {
    color: white;
    text-decoration: none;
}
section {
    padding: 2em;
}