Me as a Windows 11 user, my Geany v1.38 works fine with Monokai gtk theme, it just look very nice!
![image](https://user-images.githubusercontent.com/68846168/189480419-8b7017d0-c9b3-4...)
![image](https://user-images.githubusercontent.com/68846168/189480464-5086191a-859d-4...)
You can use my monokai gtk theme which available at my repo [Geany-WebDev-Snippets](https://github.com/zhaolinlau/Geany-WebDev-Snippets/tree/dev/themes/monokai/...), I will add more gtk 3 themes which compatible with Windows 10/11 version of Geany to my repo.