@keyframes flicker {
  0% {
    opacity: 0.13;
  }
  5% {
    opacity: 0.17;
  }
  10% {
    opacity: 0.12;
  }
  15% {
    opacity: 0.45;
  }
  20% {
    opacity: 0.09;
  }
  25% {
    opacity: 0.4;
  }
  30% {
    opacity: 0.3;
  }
  35% {
    opacity: 0.35;
  }
  40% {
    opacity: 0.13;
  }
  45% {
    opacity: 0.42;
  }
  50% {
    opacity: 0.48;
  }
  55% {
    opacity: 0.04;
  }
  60% {
    opacity: 0.1;
  }
  65% {
    opacity: 0.3;
  }
  70% {
    opacity: 0.25;
  }
  75% {
    opacity: 0.2;
  }
  80% {
    opacity: 0.37;
  }
  85% {
    opacity: 0.35;
  }
  90% {
    opacity: 0.34;
  }
  95% {
    opacity: 0.18;
  }
  100% {
    opacity: 0.12;
  }
}

.crt::after {
  content: " ";
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background: rgba(18, 16, 16, 0.1);
  opacity: 0;
  z-index: 2;
  pointer-events: none;
  animation: flicker 0.15s infinite;
}
.crt::before {
  content: " ";
  display: block;
  position: absolute;
  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));
  z-index: 2;
  background-size: 100% 2px, 3px 100%;
  pointer-events: none;
}