MediaWiki:Common.css

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/*

.vector-menu.mw-portlet li.collapsible-header,
.vector-menu-portal li.collapsible-header {
  cursor: pointer;
  font-weight: 600;
  display: flex;
  align-items: center;
}

.mw-collapsible-arrow {
  display: inline-block;
  width: 1em;
  margin-right: 4px;
  transform-origin: center;
  transition: transform 0.2s ease;
  user-select: none;
}

li.collapsible-header.open > .mw-collapsible-arrow {
  transform: rotate(90deg);
}
*/