body {
    font-family: serif;
}
a {
    color: black;
}
#main {
    width: 640px;
    margin: 0 auto;
    text-align: center;
}
#main h1 {
    text-align: center;
    font-style: italic;;
}
#main img {
    margin-top: 1rem;
    margin-bottom: 1rem;
}
footer {
    text-align: center;
    margin-top: 3rem;
    margin-bottom: 2rem;
}