html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
}
.carousel-slide {
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.8s ease-in-out, visibility 0.8s ease-in-out;
  z-index: 1;
}
.carousel-slide.active {
  opacity: 1;
  visibility: visible;
  z-index: 10;
}
.fade-in {
  animation: fadeIn 0.8s ease-in-out;
}
@keyframes fadeIn {
  from { opacity: 0; transform: scale(1.02); }
  to { opacity: 1; transform: scale(1); }
}
i.fas {
  display: inline-block;
  text-align: center;
  vertical-align: middle;
  line-height: 1;
}