How can I animate an element in a fixed position of a DIV using wow.js?

Question

How can I animate an element in a fixed position of a DIV using wow.js?

I am trying to use wow.js to animate elements as they scroll to view. The elements I want to animate are in a fixed DIV position on the page.

However, wow.js doesn't want to animate the elements as they appear, which I guess is due to the fact that the browser window itself is not scrolling, but only a fixed DIV position that has an overflow-y set to scroll.

Any thoughts on getting wow.js to animate elements in a fixed DIV position?

The green background is what I intend to bring to life.

Updated script: https://jsfiddle.net/1do305gs/7/

And the basics:

var wow = new WOW({
    boxClass: 'wow', // animated element css class (default is wow)
    animateClass: 'animated', // animation css class (default is animated)
    offset: 150, // distance to the element when triggering the animation (default is 0)
    live: true, // act on asynchronously loaded content (default is true)
    callback: function (box) {
        // the callback is fired every time an animation is started
        // the argument that is passed in is the DOM node being animated
    }
});
wow.init();

#wrapper {
    height: 300px;
    width: 500px;
    margin: 60px auto 0 auto;
    border: 1px solid black;
    overflow-y: scroll;
}

<link href="https://github.com/daneden/animate.css/blob/master/animate.css" rel="stylesheet"/>
<script src="https://github.com/matthieua/WOW/blob/master/dist/wow.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<div id="wrapper">
    <p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi. Nam liber tempor cum soluta nobis eleifend option congue nihil imperdiet doming id quod mazim placerat facer possim assum.</p>
    <p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi. Nam liber tempor cum soluta nobis eleifend option congue nihil imperdiet doming id quod mazim placerat facer possim assum.</p>
    <p style="background: green; padding: 20px;" class="wow fadeInUp animated">Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi. Nam liber tempor cum soluta nobis eleifend option congue nihil imperdiet doming id quod mazim placerat facer possim assum.</p>
</div>