Use global styles inside a local template

Hi,

I created a local template that contains 2 buttons inside a button container(its the generateblocks button). Each button has its own color, text, button alignment, paddin, etc

Can i now use this local template inside a global styles :element" to globally change the colors of the buttons at once. And if so, is it good practise to do so? Does it add extra code or maybe the opposite, reduce code cause the colors css would load only once for the buttons?

Thanks,
Mario