This gives a better appearance. Blue, tan, beige, yellow, pink, and green are fine. Gray is all right, but it's boring. Ask your Academic Program Coordinator for paper. This is the landscape orientation.
Television is a horizontal medium, and vertical graphics look awkward.
This can cause a problem if the control room operator tries to move the overhead camera to fit the top of the page, when suddenly you start talking about something at the bottom. Try to restrict graphics to a few key words and phrases. See the examples. Use handouts for tables and extensive textual materials. You may want to leave parts of your graphic blank to encourage the class to fill in missing formulas, terms, etc.