Metadata overlaps with Docs Viewer


My problem is when I add multiple files and file names into single item, the metadata then overlaps with the Docs Viewer just like shown in the screenshot below. Is there something I would need to add in themes screen.css file? I'm using "Emiglio" theme and running Omeka Version 1.5.3

In addition, I'm developing this site for our institution and it needs to be protected from public for copyright reasons. For protection we have added our institution IP ranges into htaccess which works perfectly except it partially breaks the Docs Viewer plug in and gives out this message "Sorry, we were unable to find the document at the original source. Verify that the document still exists.
You can also try to download the original document by clicking here."
Any help will be much appreciated.

I'm not sure how to fix the overlap, but the Google servers must have access to your files for the service to work. They will not work if your site is not publicly accessible.