body::after {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background:
    linear-gradient(rgba(18,16,16,0) 50%, rgba(0,0,0,0.25) 50%),
    linear-gradient(90deg, rgba(255,0,0,0.06), rgba(0,255,0,0.02), rgba(0,0,255,0.06));
  background-size: 100% 2px, 3px 100%;
  pointer-events: none;
  z-index: 999;
}
      
body {
  color: #1d2021;
}