I say today is a very basic system comes with features. It can make your top menu bar and the Dock turn black transparent state, that is, dark menu bar.
System Preferences - Universal as:
Select the "dark mode", as shown:
Highlight color, red is changed after completion, as shown:
These are the tips [Mac] how to change the color of the entire contents of the status bar at the top of it, you learn it? More Mac software https://www.macdown.com welcome your visit.