#leaves-container {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  pointer-events: none;
  overflow: hidden;
  z-index: 1;
}

.leaf {
  position: absolute;
  width: 64px;
  height: 64px;
  background-image: url('leaf.png');
  background-size: contain;
  background-repeat: no-repeat;
  opacity: 0.6;
  animation-name: fall;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
  image-rendering: pixelated;
}

@keyframes fall {
  0% {
    transform: translateY(-100px) rotate(0deg);
    opacity: .6;
  }
  100% {
    transform: translateY(100vh) rotate(360deg);
    opacity: 0; 
    
  }
}