Can not scroll on preview link - Mac

Our designers sent me a link to preview a website design and I can not scroll past the fold on either of my Macs.  I read that you need a mouse, so I tried that, and it does not scroll with a mouse, arrows or trackpad.  So I can not see the design.  Other members of my team using Macs can scroll and see the whole design.  I have the latest Chrome and Safari versions, neither will allow me to see the full page.  I borrowed a PC and it works great.  How can I scroll an https://xd.adobe.com/ preview link on a Mac?  I am in a new job and only have Macs.  I'd hate to have to purchase a PC just to view your site.  

Thanks for your help,

  Michelle