New Universal Login + Custom Domain, Not Working

I’ve used the No-Code editor to customize the “New Universal Login” to our liking.
Then when I set the site up to use the “Custom Domain” it loses the background general styling.

From what I read, I would need to tap into the Management API to apply any kind of template, but does that mean that we won’t be able to use the No-Code editor’s configurations if we’re also using the Custom Domain?