Using a light text on a light background is bad, especially for those sitting at the back of your presentation.
6. Poorly Contrasted Slides
Contrasting is one of the most important habits you need to learn for creating professional PowerPoint presentations. The worst-case scenario of this is using white text on a white background, which you’re obviously not going to do.
However, using a light text on a light background is still just as bad, especially for those sitting at the back of your presentation. If you’re using a dark background, use a light font and visa versa.