_carousel.scss

// Notes on the classes:
//
// 1. .carousel.pointer-event should ideally be pan-y (to allow for users to scroll vertically)
//    even when their scroll action started on a carousel, but for compatibility (with Firefox)
//    we're preventing all actions instead
// 2. The .carousel-item-start and .carousel-item-end is used to indicate where
//    the active slide is heading.
// 3. .active.carousel-item is the current slide.
// 4. .active.carousel-item-start and .active.carousel-item-end is the current
//    slide in its in-transition state. Only one of these occurs at a time.
// 5. .carousel-item-next.carousel-item-start and .carousel-item-prev.carousel-item-end
//    is the upcoming slide in transition.

.carousel {
  position: relative;
}

.carousel.pointer-event {
  touch-action: pan-y;
}

.carousel-inner {
  position: relative;
  width: 100%;
  overflow: hidden;
  @include clearfix();
}

.carousel-item {
  position: relative;
  display: none;
  float: left;
  width: 100%;
  margin-right: -100%;
  backface-visibility: hidden;
  @include transition($carousel-transition);
}

.carousel-item.active,
.carousel-item-next,
.carousel-item-prev {
  display: block;
}

.carousel-item-next:not(.carousel-item-start),
.active.carousel-item-end {
  transform: translateX(100%);
}

.carousel-item-prev:not(.carousel-item-end),
.active.carousel-item-start {
  transform: translateX(-100%);
}


//
// Alternate transitions
//

.carousel-fade {
  .carousel-item {
    opacity: 0;
    transition-property: opacity;
    transform: none;
  }

  .carousel-item.active,
  .carousel-item-next.carousel-item-start,
  .carousel-item-prev.carousel-item-end {
    z-index: 1;