Make the game transparent

Is there a way to make the background of the game transparent. I want to make a html game in OBS to lay over a stream. But on a scene, I can not choose a transparent background like 00000000 it does make the picker transparent but it won’t save.

Could make te green and key is but that is less nice.

GDevelop draw always a background color on every frames.
You can still use the chroma key in OBS like you said.

Maybe by tweaking the renderer of the exported game, but i can’t help you to made the change.
Just look how PixiJS make transparent background. And where is define the Pixi renderer in GDevelop’s exported code.