body { margin: 0px }

#author { display: block; text-align: center }

#main { width: 700px; margin: auto; text-align: justify; border-left: #000000 1px solid; border-right: #000000 1px solid; padding: 1em }

#main h1 { text-align: center }
#main h1,h2,h3,h4,h5,h6 { color: #333388 }

#main a { text-decoration: none }
#main a:hover { text-decoration: underline }

#navlinks {
  list-style: none; margin: 0px; padding: 1px; text-align: center;
  border-bottom: #000000 1px solid; border-top: #000000 1px solid
}
#navlinks li { margin: 0px 10px; display: inline }

dt { font-weight: bold }

.screenshot { text-align: center }

#diagrams { margin: auto; text-align: center }
#diagrams thead { font-weight: bold }
#diagrams thead tr td { padding: 2em }