Boomf offers a wide variety of husband 40th birthday card designs. Popular themes include "Best Years Yet", "To My Amazing Husband", "I Love You Because", and many more. Each design is customized with your husband's name, age, and other special details. You can also choose from a variety of card stock options, colors, and fonts. Delivery is fast and easy - just select the template you want, enter your information, and Boomf will create a perfectly personalized card for you in minutes!