body{
  padding: 0;
  margin: 0;
  overflow: scroll;
}
#video_container{
  margin: 0 auto 0;
  margin-top: 200px ;
  width: 852px ;
  height: 480px ;
}
#hana_video{
  position: absolute ;
  z-index: 2 ;
}
#bernhard_video{
  position:absolute ;
  z-index: 1 ;
}
#control_notification{
  position: absolute;
  z-index: 3 ;
  margin-left: 25px ;
  margin-top: 25px ;
  opacity: 0.75 ;
  width: 802px ;
  text-align: center ;
}
.hidden {
  display: block;
  visibility: hidden;
  opacity: 0;
}
.container_fullscreen{
  margin-top: 0px ;
  width: 100% ;
  height: 100% ;
}