You won't be able to dismiss this by usual means (escape or click button), but you can close it programatically based on user choices or actions.
"I was worried because I read a review that the colors were not as pictured online. I disagree. The background is beige, writing is brown, and top design is green. I'm really happy with my save-the-dates. They are really elegant and I highly recommend!! The only thing that was different than I expected was the size. (which to be honest, I didn't even read the dimensions before ordering). They are smaller than I had pictured them but I am actually happy about that."
"I had thought this was going to have a cream colored background. It is definitely white. They came out beautiful, but just make sure you know that the background color is white!"