body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 1rem;
    background: #f9f9f9;
    color: #333;
}
header, nav, main {
    margin-bottom: 1.5rem;
}
nav ul {
    list-style: none;
    padding: 0;
}
nav li {
    display: inline;
    margin-right: 1rem;
}