yupenyaz

Is there a way to add floating or pop-up menu inside an article?

I'm making a longread article with manuals, it consists of several parts (12 by now), each with its heading. I already added a table of contents at the top of the article with clickable links. But I'd like to add some kind of a menu with those headings that would be visible somewhere on the sideway all the way while scrolling the article. So that user could see which part of the article he's reading now and could click on other heading to get to another part.

Maybe it's available in some theme or could be added to the theme by some part of code?