[Request] Onscreen overlay "On-active only" option + semi-transparent background

[SaifAqqad]

Discussed in #35

^{Originally posted by gitmaker032 September 9, 2021}
Hello! Thanks for the great app.

But I really miss the "On-active only" (Onscreen overlay) option. For me it is more important to know when the microphone is active. A kind of explicit reminder that the microphone is active and should not forget to turn it off.

I think it would also be nice to add a semi-transparent black background for the icon, because it can blend in with the white objects on the screen now.