Image Banner: Separate Mobile and Desktop color_scheme drop-downs

[sciascia]

Describe the enhancement you'd like

To keep hero banners readable, merchants need an easy way to set a separate colour scheme for Mobile (see mockup).

Image banners with text look great on Desktop but often appear messy over images on Mobile. Enabling "Show container on mobile" usually makes text disappear since most sites use light backgrounds, and the desktop colour scheme requires light text over the image.

Describe alternatives you've considered

Hacking at the CSS with custom code which isn't practical for merchants.

Additional context/screenshots

Here's a classic example, Desktop looks great, Mobile does not....

Image Banner on mobile after CSS hacks - but setting a mobile colour scheme is practical for merchants...