What color classes should I override to have my own custom colors for all components?

I tried writing my own edc for button but I could not made the rect around text rounded. I leanrt about color clases so I thought I could override original ones to change buttons from being default blut to eg. red, but I don’t know the names. Or maybe there is other way to accomplish it?

EDIT:

I tried setting the style to one pre made (according to https://developer.tizen.org/development/ui-practices/native-application/efl/ui-components/wearable-ui-components/button#styles )

    elm_object_style_set(button2, “green”);

but the button did not change.

but 

    elm_object_style_set(button, “bottom”);

worked, despite screen being rectangle – gear fit 2.