$fade-in-animation-duration: 0.35s;

.fadeIn-enter-active {
  animation: fadeIn $fade-in-animation-duration;
  transition: opacity $fade-in-animation-duration ease-in;
}
.fadeIn-leave-active {
  animation: fadeIn $fade-in-animation-duration reverse;
  transition: opacity $fade-in-animation-duration ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}