Add Gradient capability for Background control

[Ariel Klikstein]

[Luiz Bills]

Background overlay will be greate too

[Ariel Klikstein]

@luizbills Background overlay added in V0.4.0

[netgain]

Here's a wonderfully simple but capable UI for gradient options.
https://www.minimamente.com/example/gradient-generator/

[Enkota]

Would be nice to add gradients to buttons and some other elements. Going by design recently lots of people seem to be doing it hehe 👍

[pingram3541]

Gradients would be great. It would be nice to save them in the palette as well. For example, it would be nice to re-use the same gradient in multiple places.

[pingram3541]

Thank you! =)