body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f4f4f4;
    color: #333;
}
header, footer {
    background: #0a1f44;
    color: white;
    padding: 1em;
    text-align: center;
}
main {
    padding: 2em;
}