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 got these to match my invites and got several compliments on our invitations. We were doing online RSVP's so we used these to direct people to our wedding website, and only sent response cards to our older relatives and those not as internet savvy. I went for the rounded corners, and upgraded pearlized paper. My experience with Wedding Paper Divas was great. The design team were very helpful in adjusting my custom colour until it was just right. Very fast shipping as well. Highly recommended!"