choose a font size, style, and colour that clarifies your power points; and
consistently choose a simple and light background.
Keep it Simple
Thegeneral style you use should be simple and clear to highlight your content, not confuse your content. This video outlines the general guidelines you should follow in your presentations.
Being consistent means using the same format on individual slides and throughout your entire presentation will allow your audience to focus on your content, not figuring out what you have done. This video outlines how to be consistent in your presentations.