.coin-fall{position:fixed;inset:0;pointer-events:none;z-index:1;overflow:hidden}
.coin{position:absolute;top:-64px;width:32px;height:32px;background-image:url('https://i.imgur.com/jcA7yVE.png');background-size:contain;background-repeat:no-repeat;opacity:.95;filter:drop-shadow(0 4px 6px rgba(0,0,0,.18))}
@keyframes fall {
  0%{transform:translateY(-80px) rotate(0deg)}
  100%{transform:translateY(110vh) rotate(540deg)}
}
@media (prefers-reduced-motion: reduce){
  .coin{display:none}
}