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.
"We were able to manage the text to instruct our guests to respond via our wedding website. This cut costs for the response envelopes and postage. The site kept a running spreadsheet of responses and entree choices that made things easier for turning numbers in to our venue."
"This card came out so gorgeous. My mom and I are so excited for guests to receive this. We love that we could write what we wanted on it...at the top instead of Dinner at (insert time here), we put Dinner and Dancing."
"This is a nice addition to the matching invitation. Like the other matching products, this card is printed on a very heavy and high quality textured ecru paper. It looks more expensive than it really is."