Thanks for your help. I am wondering if you really can't see the color, or if what you define as 'background color'' is not equal to my definition of it.
I will describe what I see. Text is shown in 3 colors. green on top, than a dark grey and black. Surrounding the the black and grey text is yellow. Also if you look at the images you will notice that there is white around the bulbs, actually forming a square on each. Outside of this white square (the background to the bulb within its image) is where you could differentiate that it is yellow-albeit a light yellow. If you can not see this, perhaps you may want to download the photo and see it on your monitor.
If you can see it, then this is what I am referring to as background color, the background pale yellow.