.box-enter {
  opacity: 0;
  transform: scale(0.6)
}
.box-enter-active {
  opacity: 1;
  transform: scale(1);
  transition: opacity 500ms;
}

.box-exit {
  opacity: 1;
  transform: scale(1);
}

.box-exit-active {
  opacity: 0;
  transform: scale(.6);
  transition: opacity 500ms
}