Features to my javascript app

I have a simle html javascript app i need some features added to. Right now when you put a number in the age box cards appear below. You can click on a card and its highlighted (diagram b), I want the ability for the next 12 cards to appear highlighted as outlined in diagram ( diagram c).

I also want the cards to show up at the bottom in a straight line across - as in diagram d.

https://cardology.academy/spreads/index.htm