body {
    font-family: sans-serif;
    margin: 0;
    padding: 0;
}
header {
    background: #002244;
    color: white;
    padding: 1em;
}
nav a {
    color: white;
    margin: 0 1em;
    text-decoration: none;
}
main {
    padding: 2em;
}
footer {
    background: #eee;
    padding: 1em;
    text-align: center;
}