If you open the Command Prompt, it should be evident that the background color is black. However, there are those who would prefer to change the color but have no idea this is a possibility.

The Soldiers and Civilians of the 781st Military Intelligence Battalion (Cyber), Vanguard, and 780th Military Intelligence ...

Click on the black CMD icon which appears on the top left side of the title bar and select Properties. Here you can change options, fonts, layout, and colors too. You can also change the colors ...