body {
    font-family: Arial, sans-serif;
}
header {
    background-color: #4CAF50;
    color: white;
    padding: 15px;
}
nav ul {
    list-style-type: none;
}
nav ul li {
    display: inline;
    margin-right: 10px;
}
nav ul li a {
    color: white;
    text-decoration: none;
}