Not sure if I understand what your asking. If you want to find out what background color a website is using you can either look at the html/css, use the firefox plug-in called firebug to inspect a particular element, or take a screenshot then go into a program like Photoshop (Gimp is a free program similar to Photoshop) and use the dropper tool to pull the hex code for any color on the image....hope I stated that clear enough to understand... let me know if it helps