video {
  position: fixed;
  top: 50%;
  left: 50%;
  min-width: 100%;
  min-height: 100%;
  width: auto;
  height: auto;
  z-index: -100;
  transform: translateX(-50%) translateY(-50%);
  background: url('htt//demosthenes.info/assets/images/polina.jpgjpg') no-repeat;
  background-size: cover;
  transition: 1s opacity;
}

.stopfade {
  opacity: .5;
}

#overlay {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 100;
}



html { 
   width:100%; 
   height:100%; 
   background:url(logo.png) center center no-repeat;
}

img {
  position: fixed;
  top: 50%;
  left: 50%;
  min-width: 25%;
  min-height: 25%;
  width: auto;
  height: auto;
  z-index: -100;
  transform: translateX(-50%) translateY(-50%);
}