.fade-enter-active, .fade-leave-active {
  transition: opacity 0.2s;
}
.fade-enter, .fade-leave-to {
  opacity: 0;
}

.fade-in-linear-enter-active {
  transition: opacity 0.2s linear;
}
.fade-in-linear-leave-active {
  transition: opacity 0.4s linear;
}
.fade-in-linear-enter, .fade-in-linear-leave-to {
  opacity: 0;
}