header {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 10px;
}

nav {
    background-color: #444;
    color: white;
    padding: 10px;
    margin-right: 15px;
}

body {
    font-family: Arial, sans-serif;
    margin: 20px;
    padding: 20px;
    background-color: #f4f4f4;
}


nav li a {
    color: white;
}