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Well I'd like to know if there is better way to fit the background or that's the correct...

Looking for some feedback! I'd like to know which things I can improve from my css and html :)

Hi mates! I'm looking for improve things like the structure and the usage of variables, also looking for better ways to code and performance this project. Hope you can give me a hand :)

I would like feedback on my code. I think I can simplify css but I don't know how. Would be pretty nice if I can get an advice.