BODY {
  background: #efefef;
  color: #8b475d;
 margin-left: 0.5em;
  margin-right: 0.5em;
}
H1 {
  text-align: center;
  color: midnightblue;
  margin-left: 0.1em;
}
PRE {
  margin-left:  2.0em;
  margin-right: 2.0em;
}
IMG {
  align: center;
}