MediaWiki:Common.css

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

/* Collapsible elements. Toggle-link moved to left. */
/* Margin around it adjusted. */
/* https://www.mediawiki.org/wiki/Manual:Collapsible_elements */

.mw-collapsible span.mw-collapsible-toggle {
    float:none;
    margin-left:0;
    margin-right:1em;
}

a.mw-collapsible-text:after {
  content: ' spoiler';
}

/* Tooltip container */
.tooltip {
  position: relative;
  display: inline-block;
  border-bottom: 1px dotted black; /* If you want dots under the hoverable text */
}

/* Tooltip text */
.tooltip .tooltiptext {
  visibility: hidden;
  width: 120px;
  background-color: black;
  color: #fff;
  text-align: center;
  padding: 5px 0;
  border-radius: 6px;
 
  /* Position the tooltip text - see examples below! */
  position: absolute;
  z-index: 1;
}

/* Show the tooltip text when you mouse over the tooltip container */
.tooltip:hover .tooltiptext {
  visibility: visible;
}