This issue is still being investigated, but possible resolutions are listed below:

To set the screen size on a Mac, perform the following steps:
1. Click on the System Preferences icon on the Dock.
2. Click the Displays icon.
3. Select the desired resolution - 1024 X 768.
4. Close the System Preferences Window.

There is also a known issue with Banner 7 (this may apply to Banner 8 as
well) and fonts rendering smaller on the Mac than on Windows. A couple
other schools have noted this issue in their documentation (UC Santa
Cruz, Fashion Institute of Technology) and that SCT and Oracle are
aware of it. SCT talked with the OIT Help Desk and said that Apple and
Oracle have been working together on a version of JInitiator that
would work with Safari, in an effort to resolve a number of issues.