Which class for buttons?

Maybe my question is not strictly related to Template Creator CK, but I hope someone can help.
We can define the look of buttons in Parameters → Buttons and forms. OK, great!
But which is the class of such a button? btn? button? or what else?
I need to know it because I'd like to write a Content Templater element that allows me to insert a custom button by simply clicking twice. It's a much faster procedure than using the Button element of Page Builder, but I need the name of the class.
Thank you.

Hi
you can use the class "btn" or "button", both receive the same styles
Or you can use the Custom Styling interface from the Actions menu, to create a custom css class and style
CEd

OK, thank you!