This cheerful birthday card is perfect for a youthful sister-in-law. Featuring a hip birthday cake with fondant swirls in primary colors and squiggly rainbow candles, this card is the very image of the best kind of birthday celebration! Combined with its modern, light-hearted message, this birthday card will warm the heart of any young woman. Your sister-in-law will be delighted to receive this fabulous happy birthday card from you!