XF 2.2 Replicating fixed background in iOS?

[Oblivion Knight]

I have the Zombie arms on the right hand side of Umbrella Online, which looks pretty good on most devices and resolutions barring iOS (curse you Apple!).

I've read about various workarounds, but haven't been able to get them working thus far.. Just thought I'd reach out and see if anyone had ran into similar, and found something that works?

Thanks.