.ae-fade-in
  &:hover
    animation: fadeIn 1s linear

.ae-fade-out
  &:hover
    animation: fadeOut 1s linear

.ae-ease-in-out
  &:hover
    @include easeInOut

.ae-hidden
  display: none

@keyframes fadeIn
  0%
    opacity: 0
  100%
    opacity: 1

@keyframes fadeOut
  0%
    opacity: 1
  100%
    opacity: 0