@keyframes showGrowBgStage {
  0% {
    background: rgba(255, 168, 42, 0);
  }
  100% {
    background: rgba(230,124,110, 0.85);
  }
}
@keyframes hideGrowBgStage {
  0% {
    background: rgba(230,124,110, 0.85);
  }
  100% {
    background: rgba(255, 168, 42, 0);
  }
}

.stage0 .growing_img {
  animation: 1s showGrowBgStage;
  -webkit-animation: 1s showGrowBgStage;
  animation-fill-mode: forwards;
  -webkit-animation-fill-mode: forwards;
}
.stage1 .growing_img {
  animation: 1s hideGrowBgStage;
  -webkit-animation: 1s hideGrowBgStage;
  animation-fill-mode: forwards;
  -webkit-animation-fill-mode: forwards;
}
.growing_img {
  z-index: 10;
}