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// Notes on the classes:
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// 1. .carousel.pointer-event should ideally be pan-y (to allow for users to scroll vertically)
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// even when their scroll action started on a carousel, but for compatibility (with Firefox)
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// we're preventing all actions instead
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// 2. The .carousel-item-left and .carousel-item-right is used to indicate where
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// the active slide is heading.
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// 3. .active.carousel-item is the current slide.
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// 4. .active.carousel-item-left and .active.carousel-item-right is the current
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// slide in its in-transition state. Only one of these occurs at a time.
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// 5. .carousel-item-next.carousel-item-left and .carousel-item-prev.carousel-item-right
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// is the upcoming slide in transition.
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.carousel.pointer-event {
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backface-visibility: hidden;
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@include transition($carousel-transition);
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.carousel-item-next:not(.carousel-item-left),
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.active.carousel-item-right {
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transform: translateX(100%);
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.carousel-item-prev:not(.carousel-item-right),
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.active.carousel-item-left {
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transform: translateX(-100%);
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// Alternate transitions
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transition-property: opacity;
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.carousel-item.active,
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.carousel-item-next.carousel-item-left,
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.carousel-item-prev.carousel-item-right {
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.active.carousel-item-left,
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.active.carousel-item-right {
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@include transition(opacity 0s $carousel-transition-duration);
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// Left/right controls for nav
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.carousel-control-prev,
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.carousel-control-next {
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// Use flex for alignment (1-3)
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display: flex; // 1. allow flex styles
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align-items: center; // 2. vertically center contents
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justify-content: center; // 3. horizontally center contents
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width: $carousel-control-width;
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color: $carousel-control-color;
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opacity: $carousel-control-opacity;
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@include transition($carousel-control-transition);
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@include hover-focus() {
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color: $carousel-control-color;
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text-decoration: none;
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opacity: $carousel-control-hover-opacity;
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.carousel-control-prev {
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@if $enable-gradients {
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background-image: linear-gradient(90deg, rgba($black, .25), rgba($black, .001));
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.carousel-control-next {
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@if $enable-gradients {
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background-image: linear-gradient(270deg, rgba($black, .25), rgba($black, .001));
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.carousel-control-prev-icon,
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.carousel-control-next-icon {
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display: inline-block;
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width: $carousel-control-icon-width;
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height: $carousel-control-icon-width;
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background: 50% / 100% 100% no-repeat;
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.carousel-control-prev-icon {
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background-image: escape-svg($carousel-control-prev-icon-bg);
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.carousel-control-next-icon {
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background-image: escape-svg($carousel-control-next-icon-bg);
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// Optional indicator pips
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// Add an ordered list with the following class and add a list item for each
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// slide your carousel holds.
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.carousel-indicators {
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justify-content: center;
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padding-left: 0; // override <ol> default
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// Use the .carousel-control's width as margin so we don't overlay those
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margin-right: $carousel-control-width;
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margin-left: $carousel-control-width;
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box-sizing: content-box;
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width: $carousel-indicator-width;
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height: $carousel-indicator-height;
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margin-right: $carousel-indicator-spacer;
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margin-left: $carousel-indicator-spacer;
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background-color: $carousel-indicator-active-bg;
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background-clip: padding-box;
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// Use transparent borders to increase the hit area by 10px on top and bottom.
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border-top: $carousel-indicator-hit-area-height solid transparent;
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border-bottom: $carousel-indicator-hit-area-height solid transparent;
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@include transition($carousel-indicator-transition);
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right: (100% - $carousel-caption-width) * .5;
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left: (100% - $carousel-caption-width) * .5;
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padding-bottom: 20px;
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color: $carousel-caption-color;