A Website im working on for several years now gets bigger and bigger.. CSS-Files are not very clear right now..  

How am i able to find out which code of my huge css-file is not used on my homepage? So that im able to delete this?

I recently found this:
[Removing unused CSS from website code](https://stackoverflow.com/questions/12091356/removing-unused-css-from-website-code)

The Problem is, my page got of course multiple pages. I should know which css code is not used in all of the pages.