In my install of Rawhide, gdm has a flat black background,

but in Fedora 34 Beta, it is a blue background that is different shades
of blue across the screen, sort of fading from one spot to another.

Just curious if this is intentional.

I believe this might be what some people refer to as being "more polished."
Right ?

and if there is an easy way to adjust the
background ?     

I think maybe that I once changed the background
using a text editor and a config file, but don't remember what desktop
environment I was using then, nor what display manager.

David Locklear