A feedback: The use case is less than ideal. Its CSS. That shouldn't be a problem but its (i) its not the kind of syntax I'm used to reading, and (ii) its not a ligature heavy use case.
As an instance, I'm given a choice between Fira Code and Fira Mono. First off, er... maybe don't put them together. Second, the only difference between the two, as far as I can remember is that one has ligatures enabled, one doesn't. And the CSS codebase I'm reading doesn't seem to have any ligatures, so :shrug: