I've been trying to customize the GINA Window. I made some progress but I'm now stuck.

My questions are:

• Can I change the background for the whole PW-Reset-Process? 

I changed the background in the picture "Forum_20170821_125837" but it does not change the other picture. Or the ones after.

Can I and how change the background picture for the whole PW-Reset Process?

• How can I remove the white border surrounding the Password Reset Button in the picture "Forum_20170821_125837"?

Is it even possible? If yes, where? 

• Can I remove the tiny gray line thats across the left side of the button?

If you look very closely in the picture "Forum_20170821_125837", you can make out a gray line of sorts on the left side of the button. 

Is that a graphical bug? can I remove it?

• How can I change the tiny icon in the very top left of the GINA window?

Thank you for your help!