body {
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    padding: 10px;
} 
nav {
    margin-left: 0;
    margin-top: 0;
    margin-bottom: 5px;
    background-color: #87beda;
    color: white;
}
nav ul {
    list-style: none;
}
nav a {
    color: white;
    text-decoration:none;
}
.art-source {
    width: 20em;
    font-size: small;
    margin-left: auto;
    margin-right: 0;
}
h1,h2 {
    margin: 0px;
}
section {
    margin: 0px;
    padding: 3px;
}