I thought I understood but now something new. I tried the BLOXX theme. Pasted the code into the div in the page I wanted it to show, and when I click the image (wish the gallery simply displayed) to open the gallery… the gallery takes over the entire page. I expected the image to when clicked but NOT the gallery. Quite disappointed.
You can change the opacity of the Bloxx background.
If you’d prefer the gallery to be shown from the start (without requiring an initial click), the Thumblie theme does this.
Two observations: 1) The Bloxx theme, when initiated swallows up the entire page. It does not stay in the designated div. 2) the Thumble theme does not have the Titles under the images when the gallery shows. The gallery in the Bloxx them shows the titles under the image. I noticed in this help page others liked that idea but didn’t like that one needed to activate the gallery by clicking on the X or the image. The titles only show whne the image is clicked.