ScrollBarsVisible

I have built a WebContainer and toggled the ScollbarsVisible to be Never. I have tested it with Chrome, Safari and Firefox on OSX, IOS 9 and Windows, using a laptop, iPad and iPhone. All display the behaviour well, except Safari on the iPhone. Has anyone come across this and how to resolve?

Is it exclusive to Safari for iPhone, or does Safari for iPad show the same behavior?
There have been some strange issues with Safari for iPhone.
Try setting overflow-x: hidden; in the CSS yourself.

It is exclusive to Safari on iPhone.
How do I set overflow-x: hidden; in the CSS, using the Xojo IDE? Thanks