I think colours for names of buttons are OK. I hate having to jump between CSS frameworks and trying to remember what the correct class is - danger? Warning? Er

I think colours for names of buttons are OK. I hate having to jump between CSS frameworks and trying to remember what the correct class is - danger? Warning? Error? I know what I want is red, and any time I want to change the class of a button or message/alert your core intent is to change the colour - so you might as well skip that abstraction IMO.