Now Code is written for ubuntu Mate 20.04, and also for XFCE.
This gtk3 theme is currently only for mate (and xfce).
It uses adwaita 3.24.14 code and uses nearly no images for gtk3 to be as fast as possible.
Have a nice eXperience using it ;).
Zhe icons you might find with searching for B00merang theming.Not included in the pack.