In my backup files, where are located my custom CSS?

Hello Sakin: Please, I just want to know where are located the CSS that I have been added in the "custom CSS box". Are they located in the wp-Content file? or wp-admin or wp-includes? specifically, can you tell me the path? How can I read the file, maybe using notepad? Am I asking you this, because 000webhost suspended my site with any real justification (Now I know they use to cheat people, a big scam), and I´m not sure that in the last backup I made, was included that CSS. Thank you very much