Changing 3D model viewer's background in Sense Theme

[CocoLoko]

Hi! I searched online and I can't seem to find the answer for my theme.
I'm trying to change the 3D viewer's background to black. It is set on white as default right now.

My theme's code seems to be using .json coding and some .css? I'm not sure, not a pro 😕

All I can find in my theme's code related to the 3D model viewer are these:

In the Snippet

 icon-3d-model.liquid

In the Assets

 component-model-viewer-ui.css
 component-product-model.css
 product-model.js

I tried multiple things but nothing worked.

Tell me if you need more informations?

Thank you 🙂