.scanline {
  overflow: hidden;
  mix-blend-mode: difference;
}

.scanline::before {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background: repeating-linear-gradient(to bottom, transparent 0%, rgb(4, 4, 4) 0.5%, transparent 1%);
  animation: fudge 2s ease-in-out alternate infinite;
}