Angular animate using angular-animate

index.html

<div class="animate" ng-hide="loading">
  
  ...
  
</div>

style.css

.animate.ng-enter,
.animate.ng-leave {
  transition: all ease 1s;
}

.animate.ng-leave.animate.ng-leave-active,
.animate.ng-enter {
  opacity: 0;
}

.animate.ng-enter.ng-enter-active,
.animate.ng-leave {
  opacity: 1;
}