.fade-in-enter-active {
  transition: opacity 1s ease;
}

.fade-in-enter-from {
  opacity: 0;
}

// 'slow' as in jquery.animate's 'slow' value
.slow-fade-out-leave-active {
  transition: opacity .6s ease;
}

.slow-fade-out-leave-to {
  opacity: 0;
}

.fade-out-enter-active {
  transition: opacity 0.4s ease;
}

.fade-out-enter-from {
  opacity: 1;
}