body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

header, footer {
    background: #222;
    color: #fff;
    padding: 1em;
    text-align: center;
}

nav a {
    color: #fff;
    text-decoration: none;
    margin: 0 0.5em;
}

nav a:hover {
    text-decoration: underline;
}

main {
    padding: 2em;
    max-width: 800px;
    margin: auto;
}