I have two elements:
1. A parent of fixed height, overflow:hidden
2. Its child, of larger fixed height.
You don't have to drag anything for that kind of structure. What you need is to set up the parent div with overflow-x:hidden; and overflow-y:scroll;. That way, its content will be scrollable.
If you want to hide the scrollbar, just put this property: .dragPanel::-webkit-scrollbar{width:0 !important} and that's it! I don't really know why you were thinking of dragging elements instead of just scrolling the content (which is the correct way to carry out this kind of "problems"). Anyways, I hope it helps anybody who needs to fit the same necesity. Greetings!