Remove Shadow from Login Screen

New Contributor II

I've seen several threads talking about replacing the login screen background in HS and Mojave, but I don't see anyone mentioning the shadow behind the credential fields/icons. Does anyone know how to remove this? I'd like to have a white login window with a logo, but it always turns out gray on the screen because of the shadow. I haven't been able to find the file or setting that is responsible for it though.