.treesec{position: relative;
height: 100vh;}


.falling-leaves {
  position: absolute;
  top: 0px;
  bottom: 0;
  left: 50%;
  width: 100vw;
  -webkit-transform: translate(-50%, 0);
          transform: translate(-50%, 0);
 
  background: url("../images/expo_hm.svg") no-repeat center bottom;
  background-size: cover;
  overflow: hidden;
	height: 100vh;
}

.leaf-scene {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 100%;
	height: 100vh;
  -webkit-transform-style: preserve-3d;
          transform-style: preserve-3d;
	
}
.leaf-scene div {
  position: absolute;
  top: 0;
  left: 0;
  width: 20px;
  height: 20px;
  background: url(flower.svg) no-repeat;
  background-size: 100%;
  -webkit-transform-style: preserve-3d;
          transform-style: preserve-3d;
  -webkit-backface-visibility: visible;
          backface-visibility: visible;
}