password page background optimized for mobile and desktop

[llarsfrederick]

How do I make my password page background optimized for mobile and desktop view. Desktop view looks perfect but the second I switch to Mobile view it is out of crop. 

There is no option to separate the two views. The only option I have is "background image" in the theme editor. Is there something in the coding that I need to edit/change?  Ive searched so many discussions just to find no working result. 

theme is "prestige" and website is blackoutlabz.com    password is: blackout24

See attached.... 

[Guleria]

Hello @llarsfrederick ,

If you are good with code then you can create an option image for mobile.

And call it a/to the device with media query width css.

Thanks