You're probably familiar with
-webkit-overflow-scrolling: touch; as a way to restore momentum scrolling (sometimes also called inertia scrolling) on iOS devices. Chris Coyier has an example page if you want to refresh your memory.
Now here's the thing: Windows Phone has similar scrolling behaviour which also is not "on" by default if you declare
overflow: scroll; on a container. You need to toggle it specifically, so where you put
-webkit-overflow-scrolling: touch; for iOS, you can also put
-ms-overflow-style: none !important; right next to it. Here's a short StackOverflow discussion about the fix: html5 - Div overflow scrolling when -ms-viewport is specified? - Stack Overflow