Is it Possible to Change the Color at the Top of My Blog?

Hello, can you please tell me if it’s possible to change the color of the banner/headline at the top of this site? I’m using the silveray theme.

I looked in the wordpress settings, and I don’t see a way to do it easily, I assume I will have to modify some code, just not sure where that code may lie, or what change I need to make. Thanks!