Changing the background behind Site title on Balita Woocommerce theme

HI, I have recently purchased the Balita theme. It has all installed ok and up and running. I have been using the theme customizer to change most of the colours in the theme.

The only colour I cant change is the colour behind the site title? I was wondering if anyone knows how I could do this please?

My website url is – ellies-boutique.com

Thanks in advance
Danny