#noise-layer {
  width: 100%;
  height: 100%;
  position: absolute;
  background: transparent url("/img/misc/noise.png") repeat 0 0;
  background-repeat: repeat;
  animation: 700ms infinite noise;
  pointer-events: none;
  opacity: 0.65;
}

@keyframes noise {
  0%,
  100% {
    background-position: 0 0;
  }
  10% {
    background-position: -5% -10%;
  }
  20% {
    background-position: -15% 5%;
  }
  30% {
    background-position: 7% -25%;
  }
  40% {
    background-position: 20% 25%;
  }
  50% {
    background-position: -25% 10%;
  }
  60% {
    background-position: 15% 5%;
  }
  70% {
    background-position: 0 15%;
  }
  80% {
    background-position: 25% 35%;
  }
  90% {
    background-position: -10% 10%;
  }
}