MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */

.hover-gallery {
  position: relative;
  overflow: hidden;
  display: inline-block;
}

.hover-gallery img {
  width: 100%;
  height: auto;
  display: block;
}

.hover-gallery .alt-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  opacity: 0;
  pointer-events: none;
  z-index: 2;
}

/* Only cycle alternate images while hovering */
.hover-gallery:hover .alt-image {
  animation: cycleImages 6s infinite;
}

.hover-gallery .main-image {
  position: relative;
  z-index: 1;
}

/* Keyframes to cycle through 3 alt images */
@keyframes cycleImages {
  0%, 10% {
    opacity: 1;
  }
  33.33%, 43.33% {
    opacity: 0;
  }

  33.34%, 43.34% {
    opacity: 1;
  }
  66.66%, 76.66% {
    opacity: 0;
  }

  66.67%, 76.67% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

/* Assign delays to each alt image */
.hover-gallery .alt-image:nth-of-type(2) {
  animation-delay: 0s;
}
.hover-gallery .alt-image:nth-of-type(3) {
  animation-delay: 2s;
}
.hover-gallery .alt-image:nth-of-type(4) {
  animation-delay: 4s;
}