MediaWiki:Common.css

/********* [[Template:Spoiler]] *********/
.spoiler-content {
  background-color: var(--main-background-color); /* fallback */
  background-color: color-mix(in srgb, var(--main-background-color) 80%, transparent);
  background-color: transparent;
  transition: all 0.3s;
  cursor: pointer;
  overflow:auto;
}

.spoiler-content > * {
  transition: all 0.3s;
}

.spoiler-content.hide {
  pointer-events: auto;
  background-color: transparent;
}

.spoiler-content.hide > * {
  pointer-events: none;
  opacity: 0;
}