Header Background Color

Hi, I'm using the Catch Everest free theme at the moment and was wondering how or if i can change the white color of the header (above the menu, contains the logo and social buttons) to match the logo color. Have scanned through the styles.css but couldnt find that anywhere and none of my what tried in the CSS Box worked. Its most likely really simple and my brain is just being very slow :) Site is http://www.tsionsystems.co.uk/safehands/ Thanks in advance