Due to the lighting problem in the defense venue, ppt, which looks good in color matching on the computer, may look uncomfortable, which must be noted. When making, it is best to take into account the large contrast between font and background color. The color of the font and the background color should be roughly complementary, not as good as black and white, yellow and blue. There is also the background as simple as possible, not fancy, otherwise the text is unreadable.