body {
    font-family: Arial, sans-serif; 
    margin: 0;
    padding: 20px;
}

header {
    background-color: #f0f0f0;
    padding: 10px;
}

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

nav li {
    display: inline;
    margin-right: 20px;
}