depending on whether you are using the light or dark Grid + Lightbox design, you will need to edit the light.css or dark.css file.
the gray background is set in the pg-gl class:
.pg-gl {
background-color: #1e1e1e;
}
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.