#slideshow {
  margin:0 4em 0 0;
  float:right;
  position:relative;
  height:520px;
  width:300px;
  top:0;
  right:4em;
}

#slideshow img {
  position:absolute;
  top:0;
  left:0;
  z-index:8;
}

#slideshow img.active {
  z-index:10;
}

#slideshow img.last-active {
  z-index:9;
}