<style>
.scanlines {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    pointer-events: none;
  }
 
  .scanlines::before, .scanlines::after {
    display: block;
    pointer-events: none;
    content: "";
    position: fixed;
  }
 
  .scanlines::before {
    width: 100%;
    height: 2px;
    z-index: 1001;
    background: rgba(0, 0, 0, 0.3);
    opacity: 0.75;
    animation: scanline 3s linear infinite;
  }
 
  .scanlines::after {
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 1000;
    background: linear-gradient(to bottom, transparent 50%, rgba(0, 0, 0, 0.3) 51%);
    background-size: 100% 4px;
    animation: scanlines 1s steps(60) infinite;
  }
 
  /* ANIMATE UNIQUE SCANLINE */
  @keyframes scanline {
    0% {
      transform: translateY(0);
    }
    100% {
      transform: translateY(100%);
    }
  }
 
  /* ANIMATE SCANLINES BACKGROUND */
  @keyframes scanlines {
    0% {
      background-position: 0 0;
    }
    100% {
      background-position: 0 100%;
    }
  }
</style>