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 love these and the invitations so much. They are exactly what I was looking for. I wasn't sure what they would look like with the foul on them, but I was delighted when they came. Very elegant with just a tasteful bit of sparkle to liven things up! Also, because they match the invitations and don't have a picture, we don't have to wait for the photographer to get back the pictures before writing thank you notes (which is great because I have to get them done in summer vacation or I won't have time!)"
"Exactly what we were looking for! They shipped extremely quickly too, way faster than was expected. They look great too!"
"I love how nicely this thank you matches my wedding invitations. The quality is great and it includes our new married name! A must get if you ordered the same invitations."