Is there a reference list for CSS classes?

I have to add a lot of html and css code to get the job done. But the more I progress, the more I replace my inline styles by common statements for all my pages.

And most of the time, it’s to modify padding too big, margins too small, font sizes, etc …

It would be cleaner to use the existing styles …

I’ve already found several, but not all of them always work. For example, adding the class d-none hides the element well or w-50 changes the width of the element well, but the classes sw-font-size, sw-margin-bottom do not always work.

I think the Bootstrap related elements work everywhere, but not the others.
I also searched for documentation about React but I didn’t find anything