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After this project i still have one question without an answer. Which unit should i use, pixels or REM. I read about differences and as i understand REM is based on the root size of font so it will be more "responsive" if user have some extra settings in the browser like bigger fonts. But i dont know if its commonly used by other people and i think i should consider this couse my code has to be readable and easy to edit for others and i will read a tone of code in the future written by others.