Header background color opacity

I want to make the Header background image come through a bit more, it is too faded behind the "lime-green" color. I can't seem to find the CSS to change the background color - in fact, I'd like to disable it so that the header image I assigned comes through brightly. Any suggestions?

 

Hello !

Please paste the code given below in Custom CSS section
(Appearance -> Theme Options -> Styling Options -> Custom CSS) of your dashboard.

Code:

#header .header-overlay {
opacity: 0.6;
}

Thanks,
Praveen