div.back {
  margin: 5em 0em 3em 3em;
  padding: 1.5em;
}
/* I'd like to use 
   background: transparent url(semi4x4.png)
   but semi-transparent backgrounds seem to slow down the various
   browsers a lot... */
div.back {background: #567}

div.section {
  background: white;
  margin: -3em 0 0 -3em;
  padding: 1.5em;
  border: thin solid #999;
}
div.txt {margin: 0 3em 0 3em;}