.carousel-fade .carousel-inner .item {
  opacity: 0;
  -webkit-transition-property: opacity;
          transition-property: opacity;
}
.carousel-fade .carousel-inner .active {
  opacity: 1;
}
.carousel-fade .carousel-inner .active.left,
.carousel-fade .carousel-inner .active.right {
  left: 0;
  opacity: 0;
  z-index: 1;
}
.carousel-fade .carousel-inner .next.left,
.carousel-fade .carousel-inner .prev.right {
  opacity: 1;
}
.carousel-fade .carousel-control {
  z-index: 2;
}

/*
html,
body,
.carousel,
.carousel-inner,
.carousel-inner .item {
  height: 100%;
}

.item:nth-child(1) {
  background: darkred;
}
.item:nth-child(2) {
  background: red;
}
.item:nth-child(3) {
  background: orange;
}
*/