Happy Jackson ‘Twenty-One Today’ Card This 21 st birthday card from Happy Jackson is the perfect way to celebrate any of your loved ones turning 21. The message on the front of the card reads: ‘TWENTY-ONE TODAY 21 HAVE A PROPERLY BRILLIANT BIRTHDAY!’ This card is black inside, so you can write your own message as long or short as you like! Happy Jackson Cards Suitable for a range of occasions, Happy Jackson bring you a range of fun, colourful and cleverly worded cards sure to make you, and the recipient of the delightful card smile. The card comes blank inside – plenty of space to get your creative juices flowing and the vibrant yellow envelope means your card will stand out in the pile.