Edit SDDM theme

[Jim]

I figured out how to set the background image I wanted for SDDM. The 
only problem is this big circle right in the middle for the user's 
avatar.  I got rid of the default avatar by creating a transparent image 
and setting that as the avatar.  That only leaves a gray circle right in 
the middle of the screen.

Here it is. https://ibb.co/9GMLvLN

Is there any way to get rid of it?  I've got Kubuntu 20.04.

thanks