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;
  transition: opacity 0.3s ease-in-out;
}

.hover-gallery .alt-image {
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  pointer-events: none;
}

.hover-gallery:hover .alt-image {
  opacity: 1;
  pointer-events: auto;
}