Button styling - none

Hi! In CF6 we can create a (submit) button. This button has some default classes ad styling. I can add a class of my own, but I can not chose to disable the styling from CF6 and only use my own?

I could just add a button in HTML custom code... That's what I did for now.

Type into Advanced->Extra attributes :class="your name of class"

Will this disable the 'preset' classes ad only apply the class set in this fiield? Or will this just add another class?