.js-fadeIn {
  opacity: 0;
  visibility: hidden;
  -webkit-transition: 2s;
  transition: 2s;
  -webkit-transform: translateY(100px);
          transform: translateY(100px);
}
.js-fadeIn.active {
  opacity: 1;
  visibility: visible;
  -webkit-transform: translateY(0);
          transform: translateY(0);
}