EDIT: So i found a solution, all you have to do is add a Panel into a scene, directly assign it this theme.
Then click on the theme in inspector, click on Panel > Styles, and that shows you the StyleBoxTexture.
You can copy-paste that to the Custom Styles of any PanelContainer and it works. Also, you can then make it unique and save it as a separate file, so you can easily reuse it
Hello, i can see that the Panel node is themed properly, but i can't get it to work with PanelContainer? Is there anything about Godot themes that I am missing? :D thank you for making this theme, it looks awesome