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;
}

/* Base alt-image setup */
.hover-gallery .alt-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  opacity: 0;
  z-index: 2;
  animation-duration: 6s;
  animation-iteration-count: infinite;
  animation-timing-function: ease-in-out;
  animation-fill-mode: both;
  pointer-events: none;
}

/* Activate animation only on hover */
.hover-gallery:hover .alt-image {
  animation-name: fadeCycle;
}

/* Each alt image offset by delay */
.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;
}

/* Smooth fade-in/fade-out animation */
@keyframes fadeCycle {
  0%, 20% { opacity: 1; }
  33.33%, 100% { opacity: 0; }
}