body {
    font-family: sans-serif;
    max-width: 700px;
    margin: 2rem auto;
    padding: 1rem;
    line-height: 1.6;
    background: #f9f9f9;
    color: #333;
}
a {
    color: #0066cc;
    text-decoration: none;
}
header, footer {
    margin: 2rem 0;
    text-align: center;
}