No matter what CSS I use, the Viewer's div always consumes the full screen. How can I fix it?

No matter what CSS I use, the viewer’s div always consumes the full screen. How can I fix it?

If you’re trying to modify the PrizmDoc Viewer samples, then your CSS is most likely being overridden by the setting fullScreenOnInit: true. Change this property to false and you should be able to use any of the scaling CSS that you would use on a normal div.