For most of the website where the css classes look obfuscated is because they use libraries like styled-components or emotion, it’s because it generates the css classes automatically. It’s not because they want to obfuscate it

^, also obfuscating won't help at all. the crawler can just look up the css declaration of your .obfuscated-class, if it sees { color: red } it knows the original name of .obfuscated-class is text-[red] or something similar.

and css is just for styling. crawlers crawl to get textual content, they don't really care about whether your cta button background colour is #482a2b or #a83b24.

css obfuscation doesn't help with anything.

even tho the statements above are true, if you still want to do the obfuscation then this repo might be worth checking out:
https://github.com/soranoo/next-css-obfuscator/

Its also worth noting that its not exactly legal to copy someone elses websites, so if someone does copy your website you could get them into legal problems.

https://www.google.com/search?client=firefox-b-d&q=+copyright+law
https://www.google.com/search?client=firefox-b-d&q=Intellectual+Property
You could also add a license to the website/project/repo.

@Sage Thrasher If you dont need any more help, please mark a solution.