Steps to replicate the issue (include links if applicable):

• Visit https://ru.m.wikipedia.org/wiki/%D0%92%D0%B8%D0%BA%D0%B8%D0%BF%D0%B5%D0%B4%D0%B8%D1%8F?safemode=1&uselang=ru
• Visit https://ru.m.wikipedia.org/wiki/Хребет_Национальной_академии_наук_Таджикистана?safemode=1&uselang=ru

What happens?:

The checked button is floated to the right of the screen and eats into the hatnote notice at the top of the page

This looks far worse on mobile:

and sometimes spills out of the screen in certain languages (replicate using iPhone 15 Pro Max display of around 430px)
{F54251714}

What should have happened instead?:
Russian Wikipedia has a CSS rule in its site CSS that clears the float. At the very least this float should be cleared at lower resolutions