Installed the hyper-opacity, not working for me

[yodabytz]

Installed the hyper-opacity but putting opacity: 0.85, does not work on my version Hyper 3.4.1 (stable). I have it in the correct position, actually tried them all. What works for me is putting something like this backgroundColor: 'rgba(31,29,29,0.45)',

Any ideas why?

iMac MacOS Monterey