/*********************************
 * CSS @media screen (not projection or print)
 *
 * 1) projection -> slideshow mode (display one slide at-a-time; hide all others)
 * 2) screen     -> outline mode (display all slides-at-once on screen) 
 * 3) print      -> print (and print preview)
 *
 * toggle between projection/screen (that is, slideshow/outline) mode using t-key
 */
.slide {
  display: block !important;
  margin: 1.5em 0 0;
  border-top: 1px solid #888;
}
.slide h1 {
  border-bottom: 1px solid #AAA;
}
.slide:first-child {
  margin: 0;
  border: none;
}
.slide:first-child h1 {
  border: none;
  padding-top: 1.5em;
}