System Information
Operating system: Windows-10-10.0.19042-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1650 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.12
Blender Version
Broken: version: 3.0.0, branch: master, commit date: 2021-12-02 18:35, hash: rBf1cca3055776
Worked: 2.93
Short description of error
There is no option to change NodeGroup background color (with alpha).
Also (if it's intended for 3.0, but imho it's a bad decision) BG color in ShaderEditor is different than in NodeGroup
Exact steps for others to reproduce the error
default "Blender Dark" theme
| in Shader Editor | in NodeGroup |
more visual example:
if we change "Themes - Node Editor - Theme Space - Window Background" green channel to 0.5
| in Shader Editor | in NodeGroup |
Also, alpha for Group Node color in 3.0.0 not working as in 2.93
| Blender 2.93 | Blender 3.0.0 |



