Hello,

from your screen it seems you have chosen green variation.
You can edit the main file for the styles and override the color, the file is named main.cssin the folder templates\responsivizer\css\main.css

Otherwise you can replace the color directly in the variation files at this paths:

templates\responsivizer\css\themes\backgrounds\green.css
templates\responsivizer\css\themes\typography\green.css

the typography files contain styles for menu variations.

Regards,

John