MediaWiki:Common.css

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.mw-custom-collapsible .vector-menu-heading::after,
.mw-custom-collapsible h3::after {
  content: '▸';
  float: right;
  transition: transform 0.2s;
}

.mw-custom-collapsible.is-open .vector-menu-heading::after,
.mw-custom-collapsible.is-open h3::after {
  transform: rotate(90deg);
}