Without this change the big play button is always above the attribution. I changed it to match the z-index we use for the attribution container. This way when it's open it will be above it and when it's closed it doesn't interfere visually with the elements on screen.

I really wish we could just write this in LESS and also bring it within the rest of the CSS system. Right now you just have to KNOW this exists and to change it here which kind of sucks.