.fade-in {
  opacity: 0;
  transition-duration: 500ms;
  transition-property: opacity, transform;
}

.fade-in-up {
  transform: translate(0, 50px);
}

.fade-in-down {
  transform: translate(0, -50px);
}

.fade-in-left {
  transform: translate(-50px, 0);
}

.fade-in-right {
  transform: translate(50px, 0);
}

.scroll-in {
  opacity: 1;
  transform: translate(0, 0);
}