Go to https://ru.wikipedia.org/w/index.php?title=%D0%92%D0%B8%D0%BA%D0%B8%D0%BF%D0%B5%D0%B4%D0%B8%D1%8F:%D0%A4%D0%BE%D1%80%D1%83%D0%BC/%D0%9D%D0%BE%D0%B2%D0%BE%D1%81%D1%82%D0%B8/Flow&action=edit-header and click the formatting dropdown, and you'll see this:
In addition to the controls getting cut off, the license text is also uncomfortably tiny, and gets cut off if you increase the font size.