Add gifs of CSS tweaks

[0xRaduan]

I think it would be great to add gifs of how the CSS tweaks would work to the readme. Otherwise, it's hard to decide whether to use it or not.

[kmaasrud]

I agree, that would be a nice addition!

Sadly, I am not actively maintaining this repo, only handling incoming PRs. If you or someone else would like to give it a go, please feel free to submit a PR referencing this issue and I will most likely merge it 😄

[konhi]

Done!