body {
    background-color: #212121;
    color: white;
    font-family: 'Roboto', sans-serif;
}

header {
    background-color: #333;
    padding: 10px 0;
}

nav {
    text-align: center;
}

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

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

nav ul li a {
    color: white;
    text-decoration: none;
    padding: 5px 10px;
    transition: background-color 0.3s ease;
}

nav ul li a:hover {
    background-color: #555;
}