.crt-overlay{
  pointer-events:none;
  position:absolute; inset:0; 
  background:
    linear-gradient(rgba(255,255,255,.03), rgba(0,0,0,.04)),
    repeating-linear-gradient(0deg, rgba(255,255,255,.06), rgba(255,255,255,.06) 2px, transparent 2px, transparent 4px);
  mix-blend-mode:overlay;
}