body {
  font-family: arial, sans-serif;
  color: black;
  background-color: white;
  margin: 1ex 5%;
}
.annotation { font-family: times, serif; }
#head, #footer, h2 { background-color: #9cf; }
#head { text-align: center; }

div.illus { clear: both; border-top: thin black solid}
div.caption { margin: 1ex 0; }
div.illus img { margin: 1ex 1.5em; }
div.illus.odd img  { float: left; margin-left: 0; }
div.illus.even img { float: right; margin-right: 0; }

#footer { 
  clear: both;
  padding: 0.3ex 1em; 
  height: 35px; 
  font-family: trebuchetms, arial, sans-serif;
  font-size: small;
  font-weight: normal;
  font-style: oblique;
}
img.w3icon { width: 88px; height: 31px; border: 0; float: right; }