.header { width: 50%; margin: 0 auto; font-size: 4em; }

.body { margin: 2em auto; width: 65%; font-size: 1.25em; line-height: 1.2em; }

.subheader { font-weight: bold;  }

.body pre { padding: .8em; font-size: .67em !important; background: #e0e0e0; border: 1px solid #c0c0c0; margin-bottom: 2em;}

img { border: 0px; vertical-align: middle;}