gallery3/modules/slideshow/css/slideshow.css

#gSlideshowOverlay {
  border: none;
  margin: 0;
  padding: 0;
  background-color: #000;
  position: absolute;
  top: 0px;
  left: 0px;
  width: 100%;
  height: 100%;
  opacity: 0.7;
  filter: alpha(opacity=70);
  -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial;
  -moz-background-inline-policy: -moz-initial;
  z-index: 2001;
}

#gSlideShowImages {
  z-index: 2002;
}

#gSlideShowImages img {
  display: none;
  float: left;
  z-index: 2002;
}

#gSlideshowButtonPanel {
  bottom: .5em;
  position: absolute;
  width: 100%;
  z-index: 2004;
}

#gSlideshowButtonPanel div {
  background-color: #000;
  color: #fff;
  filter: alpha(opacity=70);
  height: 55px;
  margin: 0 auto;
  opacity: 0.7;
  width: 232px;
  z-index: 2004;
}

#gSlideshowPrevious,
#gSlideshowPause,
#gSlideshowResume,
#gSlideshowResume,
#gSlideshowClose,
#gSlideshowNext {
  background-image: url(buttons.png);
  background-repeat: no-repeat;
  display: block;
  float: left;
  height: 55px;
  overflow: hidden;
  text-indent: -99999px;
  width: 58px;
}

#gSlideshowPrevious {
  background-position: 0 0;
}

#gSlideshowPrevious:hover {
  background-position: -58px 0;
}

#gSlideshowPause {
  background-position: -174px 0;
}

#gSlideshowPause:hover {
  background-position: -116px 0;
}

#gSlideshowResume {
  background-position: -290px 0;
  display: none;
}

#gSlideshowResume:hover {
  background-position: -232px 0;
}

#gSlideshowNext {
  background-position: -406px 0;
}

#gSlideshowNext:hover {
  background-position: -348px 0;
}

#gSlideshowClose {
  background-position: -464px 0;
}

#gSlideshowClose:hover {
  background-position: -522px 0;
}