Mimosa 21st Birthday Card Celebrate a birthday in style with this simple and elegant greetings card. The front of the card features the words:  21 years young!  in embossed gold and purple script on a textured surface. The inside of the card reads Happy Birthday with plenty of space to add your own personal message. The card measures 13.5cm x 16cm and comes with a brown paper envelope. Paperlink Paperlink is one of the greeting cards industry market leaders, specializing in contemporary and humorous cards. Founded in 1985, the Paperlink collection encompasses all occasions and the designs include beautiful imagery, funny cartoons and witty typography - a card for everyone!