Password page Background won’t resize

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I’m in desperate need of help. I do not code or know anything about coding. I’m trying to build my website using the Brooklyn theme and I’m starting with the password page. I have changed the background image to a blurred jpeg of my logo. The issue I’m running into is that when I switch to one of the three modes (mobile, desktop and whatever the other is) the picture does not resize and stay center. It’s offset in a different position in each mode. Can anyone help me? Or give me a code and tell me where to place it to fix it? I don’t have any spare money to hire a website builder or I would of already done it and I’ve been researching and trying different things for hours now. Any help is appreciated.