How can I change the header color of the UE4 Editor?

[anonymous_user_d60a3282]

In unreal engine, there is a light gray and a dark gray header

https://lh5.googleusercontent.com/GwNAsfrjiCZ4su19edhkP-aAO6MmTgrTe8ReeYOx_zjv1OpRwkXprTDmYlZ5Yu8GHSbO8bo_WrG4g0uIJy6w0MvwD_5RopBm7gXYKvHJwd8T3o97GW5iwPo3WEsT4VIW7Q

I was wonder how (and where) in the source code I can find where to change the color to perhaps, red and dark gray, and change the color of the UE icon next to the tab?

Sorry if this is an odd question, but thanks