/* Popup boxes will have a light yellow background and a black border */
div.popup {
  display: none;
  background: #ffc;
  border: 1px solid black;
}

div.expand { display: none }

div.reveal:hover div.popup {
  display: block;
  position: absolute;
  margin-left: 3em;
}
.popup dl { margin: 5px; }

tr:hover div.expand {
  display: block;
}

/* Just some optional color and border styles: */
body { background: #eee; }
table { border-collapse: collapse; }
td, th { padding: 5px; }
th { background: #9df; }
td { background: white }