Background image not filling

[TonTonAsoX]

I recently change the background of my modpack with CustomMainMenu, but after many tries and changes, my background isn't filling. I tried all modes for it and nothing changes.

[ghost]

if you just want an image, no panorama/only 1 image try this code:
image.txt
You need to delete the panorama if you do
I hope it helped if not dm me on discord: Captin500#9774