body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
    text-align: center;
}
header, footer {
    background-color: #004466;
    color: white;
    padding: 20px 0;
}
main {
    padding: 40px;
}
a {
    color: #004466;
    text-decoration: none;
    font-weight: bold;
}