I am trying to figure out a way to overide parts of the GXT styling without the need to create a new appearance or widget.

For example, i want to create a custom font size button. I want all the stylings of a normal button except for the font size, style, family etc.

Is there are way to achieve this?

GXT 2 was much simpler in that the styles were not obfuscated and we could overide the font size by specifying the class and adding our custom style to get a more specific css selector and then use a global css file to define the actual style.