Here's the problem. Your object's native dimensions are this:
width="1220" height="970" (pixels)
An average desktop display like mine is 1280 x 768 (maximized).
For your object to "fit" my viewport width, the object must rescale proportionally to 1280 x 1018 which cannot possibly fit the height of my display without using the browser's vertical scrollbar. Short of resizing your stage height in Edge Animate, I think you'll need to live with this.
Nancy O.