body {
  font-family: helvetica, sans-serif;
}
a {
  text-decoration:none;
}
a.nav_bar {
  width:8em;
  float:left;
  text-align:center;
  background-color:#CCCCFF;
  border-left:3px solid #DDDDFF;
  border-right:4px solid #8888AA;
  border-top:2px solid #EEEEFF;
  border-bottom:2px solid #666699;
}