How to create transparent buttons?

I’ve noticed recently that transparent buttons are no longer possible in this build of data studio. I’ve tried making the background of the buttons transparent to no avail. I tried the opacity method but it looks like the floor is locked at 60%. Is this a bug or intended? If intended, is there another workaround to making buttons transparent again??

I would prefer if there were a way to put the buttons over logos with full transparency or opacity

Slight bump, hoping for an answer, solution, advice or clarity?