What color does the red background wall match?

Red is a warm color. I think it's better with light yellow. Purple is too deep, orange is close to red, and green and blue are too tacky. If you want to use the above colors, I think it is better to use red with some white.

It also depends on what you are-red, purple, orange, scarlet, pink ... different colors.

The reverse color of big red is cyan.