body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    margin: 0;
    padding: 0;
}
header, footer {
    background-color: #003366;
    color: white;
    padding: 1rem;
    text-align: center;
}
nav a {
    margin: 0 10px;
    color: white;
    text-decoration: none;
}
main {
    padding: 20px;
}
ul {
    list-style-type: square;
}