slimScroll and twitter widget wont work on mouse wheel

Question

I have example at

$(function () {
           $('#scroller').slimScroll({
               height: 600,               
            });
        });
[codepen](https://codepen.io/anon/pen/xyyoPe)

My problem is that i cant get the scroll to work with the mouse wheel and slimscroll in this example. I dont know if the css is the issue or if the whole div setup is wrong.