un-style option?

Hi, like it so far.
How can I do a no-style option? I’d want to use all my default CSS for fields, submit etc but the plugin writes a few styles inline into the buttons and I don’t know what CSS I’d use to revert it all back. I’m using “inherit” mostly but for borders and a few things it doesn’t undo it properly.

I’d basically want a null option for sizes, colours, padding etc.