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 loved the sturdy quality of the paper and the print quality of the photo was fantastic. I loved that i could change the colour to fit my colour scheme and photo. Text font choice was great and when I made a mistake and had to contact you to fix it, you were unbelievable. The speed at which you fixed my card was amazing! Thanks! Many people loved our card and I thank you for your help!"