.bg {
  width:100vw;
  height:100vh;
  top:0;
  left:0;
  position:absolute;
}

#mindwave-bg {
  image-rendering: pixelated;
  z-index:-1;
  background: url('/imgs/shrines/mindwave/spr_mmbg_8stuff.png');
  background-size: calc(2 * 1000px);
  animation: mindwave-bg 15s linear infinite;
}

@keyframes mindwave-bg {
  100% {
    background-position: left 0px top 0px;
  }
  0% {
    background-position: left calc(2 * 1000px) top calc(2 * 1000px);
  }
}