How to change password page background image without changing the whole website

[nearo__]

Hello everyone,

I've been browsing the whole shopify discussions and even used chatgpt for some problems but cant seem to find a fix for this one. I'm trying to change my password page to a single background image and so far i've managed to do that. but with this code my whole website background changes to that image when i only want the password page to be changed. also for some reason the image looks perfect on desktop but on mobile its very buggy and the image is only shown on the header? any help would be wonderful. thanks! (im using default dawn theme)