Thanks, I had a look at it and saw the same thing on my iPhone 8. I used Mac Safari to inspect it and saw something interesting: there is an additional style in the outermost control which reads min-height: 647px.
If I change this to 667px, it’s fine. Do you know of anything in your code which could be setting this?
NSBPage.style.minHeight = “667px”
(Changing this value at runtime is the wrong thing to do here - it automatically do the right thing)