body {
    font-family: Arial, sans-serif;
    background-color: whitesmoke;
    color: black;
    text-align: center;
}

a {
    color: black;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

header, footer {
    padding: 10px;
    border: 1px solid black;
}

main {
    max-width: 600px;
    margin: auto;
    padding: 20px;
}