Vertical Scroll Bar Isn't Showing

I have this website: http://fosterinnovationculture.com/infographic/index.html and I'm having a problem displaying the vertical scroll bar. The parent div has a style of overflow:

Solution 1:

Before giving an answer, I will say that the most important thing I tell myself when coding CSS is: if I start having to hack then I am making it too complicated.

With that said, start by removing every instance of overflow: hidden; in your code.

Then get this in there:

.top-nav {
    height: 70px; /* you already specify this on your site */
}
.scroll {
    position: absolute;
    top: 70px;
    bottom: 0px;
    left: 0px;
    right: 0px;
    overflow-y: scroll;
}