#particles-js {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  background-size: cover;
  opacity: 0;
  pointer-events: none;
  transition: opacity 800ms ease;
}

#particles-js.is-active {
  opacity: 1;
}

#particles-js canvas {
  display: block;
  width: 100%;
  height: 100%;
}



@keyframes pulse {
  0%, 100% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0.4;
  }
  50% {
    transform: translate(-50%, -50%) scale(1.3);
    opacity: 0.1;
  }
}