What does it mean to have a black door on a yellow background?

The door with black characters on a yellow background gives people a calm and serious feeling visually, and at the same time, it can highlight the content of the text. In addition, in the five elements, yellow belongs to soil and black belongs to water, and soil can prevent bad feng shui from entering the store. Therefore, using black characters on the yellow background in front of the store can produce a sense of visual difference and achieve remarkable results.