mediawiki-extensions-RevisionSlider/modules/ext.RevisionSlider.monobook.css

/* HACK: Monobook uses x-small and a globalWrapper to make everything
   inside of it appear normal. However, the revslider-tooltips are
   not inside this globalWrapper, and thus need a separate CSS rule.
   Once this issue is fixed, this rule can be removed. (T166231) */
.mw-revslider-tooltip {
	/* stylelint-disable-next-line unit-blacklist */
	font-size: 0.8rem;
}