Portal Font Size

Is it possible to change the portal font size—specifically for the reports? We are running Decisions v4.0.11. I have some users that complain about the larger font size showing in the “Current Assignments” and other reports.

Thanks.

I would like to extend this question by asking if I can change the colours if I preferred.

I went to System > Settings > Designer > Edit Portal Settings and couldnt find where I could change CSS for the banner, font color etc

Thanks