Information

(you can remove whatever is not applicable)
Minecraft version: 1.21.1
Modloader: Forge
Forge version: 52.0.10

Mod name: Simple Menu
Mod version: 1.21.1-1.5

Question

None of the background images i set work, every single other feature of the mod works fine though, i tried 10 different images, all renamed to (background.png), and yes i set the option in the config to true for having a custom background, does the image need to be a very specific size, or has this specific feature stopped working in this minecraft version? All i get is the default minecraft background animation