Newbie help for IE display

Newbie help for IE display

I have created 2 small payroll apps and they work great, look great!! (Thanks JQueryMobile!)  However, the  bosses don't like the way it is seen on IE since it fills the entire screen.  I have googled and tried some suggestions found on stackoverflow, but doesn't reduce the size on the desktop.

Now my choices are create 2 screens, one for mobile and 1 for desktop, or find a way to make it fill maybe 50% of the desktop.  Currently the company's portal is supported only thru desktop on IE, Firefox, and sometimes Safari. (we use SAP, and they do NOT support anything by Google).

Where should I start looking?