dbr/pb_public/css/slideshow.css

.slideshow-info, .slideshow-docs {
  position: absolute;
  padding: 5px 10px;
  background: rgba(0,0,0,.8);
  color: #fff;
  visibility: hidden;
}
.slideshow-docs {
  right: 0;
  text-align: right;
}
.slideshow-docs span {
  display: block;
}
.slideshow-wrapper {
  width:100%;
  height:100vh;
  overflow: hidden;
  background-position: center;
  background-size: contain;
  background-repeat: no-repeat;
}
.slideshow-wrapper video {
  object-fit: contain;
  width:100%;
  height:100%;
}
#slideshow-next, #slideshow-prev {
  position: absolute;
  top: 70px;
  width: 40px;
  text-align: center;
  font-size: 2em;
  height: calc(100vh - 70px);
  background: rgba(0,0,0,.2);
  border: none;
  color: #fff;
  z-index: 10;
}
#slideshow-next.hidden, #slideshow-prev.hidden,#slideshow-autoplay.hidden {
  display: none;
}

#slideshow-autoplay {
  position: absolute;
  bottom: 5px;
  text-align: center;
  font-size: 2em;
  width: 5em;
  left: calc(50% - 2.5em);
  background: transparent;
  border: none;
  color: #fff;
  z-index: 10;
}
#slideshow-autoplay:focus {
  outline: 2px solid #fff;
}
#slideshow-next:focus, #slideshow-prev:focus {
  border: none;
  color: lime;
  outline: none;
}
#slideshow-next {
  right: 0;
}
.slideshow-wrapper[data-loaded=false]::after {
  content: ''; /* loading <- Textanzeige */
  position: absolute;
  top: 3em;
  background: rgba(0,0,0,.8);
  padding: 5px 10px;
  font-size: 1.5em;
  z-index:10;
  color: #fff;
  transition: 200ms;
}