Region issue - css to colour background full screen

Hi WPMU,

Hope you're well.

Hope you can kick start my use of Upfront. I'm trying to customising a region background.

So far I've added an image background & set to 100% of the site container. I've then added text on the top. So far, so good. This region looks great on a small screen, please see region-small-screen.png.

However it doesn't look great as the window or screen size increases, the background sides are white, please see region-large-screen.png.

How can I colour the left and right sides of the region to match the image colour #0f5968?

Hope you can help with this, I'd find this particularly useful.

Thanks!
Kevin