Header template

Hi ! First of all, congratulation for this theme ! As many others say, this theme is better than many commercial ones ! I would have a quick question regarding the header section : I need to have the background of the header section to be transparent so that the user can see the background image from the website (which is the “body” background). I just want the header section (the title, with the “Just another wordpress blog” sentence) to be transparent. Basically, instead of having a “gradient option”, having a “transparency option” for example. Can you please tell me how to do that ?

Many thanks ! and fabulous work !