Scrolling is janky on iOS

When using this on an iOS device, the scrolling seems a bit janky for the main content area. The hardware-accelerated scrolling is no longer there. I also notice that the typical iOS trick by tapping the iOS status bar to scroll all the way up to the top does not currently work.

Tested with iOS 10 in Safari and Chrome

I've done a bit of inspection myself and it seems like the problem originates from the `height: 100vh; overflow: hidden;` property on one of the components.