> Incidentally, but very likely related, I always failed to have any glimpse into how design works. I have no idea which colors "go" with which ones, and pretty much all fonts look like the same for me.
This is not related. There is no magic or natural connection between grokking CSS and having a sense for color theory or typography. They are connected by circumstance only, in that they're all useful for web design, and in that CSS can control colors and typography in the web browser. CSS is not any more an "art" thing than Javascript or C, although it is a thing with which one can make art (as are Javascript and C).
This is not related. There is no magic or natural connection between grokking CSS and having a sense for color theory or typography. They are connected by circumstance only, in that they're all useful for web design, and in that CSS can control colors and typography in the web browser. CSS is not any more an "art" thing than Javascript or C, although it is a thing with which one can make art (as are Javascript and C).