body
{
  background-image: url(chalk.bmp);
  color : #000000;
  font-family : serif;
}

h1, h2, h3, h4, h5, h6 {
  color : gray;
  font-family : Arial, Helvetica, sans-serif;
}

/* text written by Col. Houston goes in div houston */
.houston p {
  text-indent: 1.0em;
}
.centered {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

/* Book and article titles */
span.title { font-style: italic; }