MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
.mw-collapsible {
  margin-bottom: 10px;
  border: 1px solid #ccc;
  padding: 5px;
}

.mw-collapsible .mw-collapsible-toggle {
  display: inline-block;
  margin-right: 5px;
  cursor: pointer;
}

.mw-collapsible-content {
  margin-top: 5px;
}

.mw-collapsible.mw-collapsed .mw-collapsible-content {
  display: none;
}