What's the best way to redesign and test a website's CSS that you don't control?
I want to volunteer a new (hopefully much improved) web design for a certain website. I obviously wouldn’t be able to test it by uploading anything to the actual server.
What’s the best approach for doing this? I’m assuming one would just store the CSS and HTML files locally and link to the local from the website pages’ html?
This question is in the General Section. Responses must be helpful and on-topic.