How to implement the background in a picture?
Hi,
I hire a webdesign company to design a website. The designer implement the homepage. I cut the header part of the page, as below:

In the upper section, the background is using a very light blue. And I can notice the color in the border is deeper than those in the center. I ask the designer how to implement such a feature, but it seems that the designer cannot understand me very well. After several communications back and forth, I give up and decide to ask on the PS forum.
Can anyone tell me how to implement such a background? Is it using "Inner Shadow" effect or "Gradient Overlay" or other effects?
Thank you very much. !

