.crt-shell::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:repeating-linear-gradient(0deg,rgba(255,255,255,.025) 0 1px,transparent 1px 4px);
  mix-blend-mode:screen;
  opacity:.45;
}
.crt-shell::before{
  content:"";
  position:absolute;
  inset:-10%;
  pointer-events:none;
  background:radial-gradient(ellipse at center,transparent 48%,rgba(0,0,0,.35) 100%);
  z-index:4;
}