body { margin: 0px; }
#nav { background-color: #ddd; width: auto; padding: 1em;
       border-bottom: 2px solid #900; text-align: right;}
.main-page { display: block; float: left; }

#content { clear: both; margin: 2em; }
h1 { text-align: center; font-size: 180%; color: #900; }
.intro { margin: 1em; font-style: italic; }

/* The standard table layout -- simple black borders all around */
table { border-collapse: collapse; }
td,th { border: 2px solid black; padding: 3px; }