.sterrennacht, .twinkling {
  position: absolute;
  display: block;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  width: 100%;
  height: 100%;
}

.sterrennacht {
  z-index: 0;
  background: transparent url("../img/bg/stars.png") repeat top center;
	transform: translateZ(-100px);
}

.twinkling {
  z-index: 1;
  background: transparent url(../img/bg/twinkling.png) repeat top center;
  -webkit-animation: move-twink-back 300s linear infinite;
          animation: move-twink-back 300s linear infinite;
}
@-webkit-keyframes move-twink-back {
  from {
    background-position: 0 0;
  }
  to {
    background-position: -10000px 5000px;
  }
}
@keyframes move-twink-back {
  from {
    background-position: 0 0;
  }
  to {
    background-position: -10000px 5000px;
  }
}