.fade-in {
  opacity: 0;
  -webkit-transform: translateY(20px);
          transform: translateY(20px);
  -webkit-transition: opacity 1s ease-out, -webkit-transform 1s ease-out;
  transition: opacity 1s ease-out, -webkit-transform 1s ease-out;
  transition: opacity 1s ease-out, transform 1s ease-out;
  transition: opacity 1s ease-out, transform 1s ease-out, -webkit-transform 1s ease-out;
}
.fade-in.visible {
  opacity: 1;
  -webkit-transform: translateY(0);
          transform: translateY(0);
}