Complementary colors are pairs of colors which, when combined or mixed, cancel each other out by producing a grayscale color like white or black. When placed next to each other, they create the strongest contrast for those two colors. Complementary colors may also be called "opposite colors".
Explanation:
i cannot help with the powerpoint because i have not seen it but i hope you can figure it out based on my explanation. there are many videos and articles on he internet you can use as reference if you need further assistance
