Header bar in Boss 2 theme

Hi. I am using the Boss 2.0 theme. I have no idea how to change the color of the top bar. Here is a picture of it: https://infoflomobile.tinytake.com/sf/MTQ2NzY1Ml81MTg4NTE4

I know how to change the color of everything else, just not that. Please help.

Thank You,
Eran