Will the css styles that are uploaded to git fly off if I run the old css file in which I made changes?

Question

css

Will the css styles that are uploaded on git fly off if I run the old css file in which I made changes.
It turns out that I uploaded the current css file to the git. Then, by chance, I started editing the old css file on my computer, in which there are no styles, as in the current css.If I upload the old css files to git, will my current styles fly off on the git? Or just the css file will be supplemented with the styles that were added to the old css file? Or just my current css will be replaced to the old css ?