Firstly, your outer group was about 500 time the size of your project - it should be the save width and height.
Your resizing should also be on shrink to fit or expand. You need to play around with it to get your desired result.
I've included the fixed hype file, and an exported version with some JS that keeps your height the same ratio as it resizes.
Hope this helps
(Link deletes in 7 days)