I am working on a website and added an animation of clouds flowing using adobe edge animation.
I have created a thread over at the adobe community (http://forums.adobe.com/thread/1128782) and it seems that my code to make it responsive, and the overflow are correctly setup.
So basically I have no idea why WordPress is either breaking it. Or why my little bit of code thinks the website is wider than it really is. Maybe fresh eyes can see something I am not.
correct your container has an overflow attribute most likely set to scroll within your css file.
set this to;
overflow: hidden;