vue-ptc/src/style/animate.scss

.fadeIn {
  animation: fadeIn .3s;
}
.fadeOut {
  animation: fadeOut .3s forwards;
}
@keyframes fadeIn {
  0% {
    opacity: 0;
  }
}
@keyframes fadeOut {
  100% {
    opacity: 0;
  }
}
@keyframes rotate {
  100% {
    transform: rotate(360deg);
  }
}