Not much I can explain the black color. black color is a collection of all colors, because we all also know that black is the opposite of white. but that does not mean that using the color black would be bad. on the contrary, black is the color of a hard, firm and sure. This represents a leader and a leader must be able to manage all his men.
use black color if you want to highlight the nature of hard, firm and sure.
black is also almost the same as white, because black color can give the impression of respect.