How to open someone else's site in a browser with your own css?

Question

css

I use one service very often, and therefore the proposed background pictures quickly get bored.
Is it possible to use the site and add your own css (change the link in the background to your own)?
But in such a way that when refreshing the page, everything does not go astray

Answer 1

https://chrome.google.com/webstore/detail/stylebot...
the essence is clear, then google for yourself