how to solve dark edges image area when using transparency in eevee SOLUTION that worked for this project: edge fading to 0 AND mark overscan

I am trying to adapt an image i made in cycles to eevee.
this has a (up &amp; down moving) flat, transparent layer slightly beyond the full width of the camera view with a white background.

I have used settings as set out here:
Does transparency work in eevee

however, when I render in eevee the transparent material is getting darker near the camera borders. (not the white background)

I've tried making the transparent layer wider, and did some changes in lighting, unchecked passepartout in camera(although that stated outside the image area). but that did not resolve it. Turning the sun off did make a change.

This is not what i want, so is it possible to turn that feature off?

i've made an example file(is the picture above):
There is a setting under Screen Space Reflections on the Render Settings tab called Edge Fading. Just turn that to zero.