#autumn-leaves {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 99999;
  pointer-events: none; /* so it never blocks clicks */
  display: block;
  opacity: 0.75;
}

@media (prefers-reduced-motion: reduce) {
  #autumn-leaves { opacity: 0.6; }
}