Support automatic light/dark mode from system preference

Support automatic light mode and dark mode based on system preference.

It would be nice if Auth0 would support setting branding for the Universal Login page for both light and dark mode and allowing a theme setting of “Auto” that would be based on the system preference (e.g. @media (prefers-color-scheme: light)). This would allow the the background colors, text colors, etc. to be decided for each mode and then the user’s preference could be supported in both cases.

The application that I work on supports both light and dark mode styling that is based on the user’s system preference. Currently I can only set the branding colors for the login page in the Auth0 management console to either light or dark which can make the Auth0 login page stand out during the login flow.