Four Card Feature (using Grid with 3 columns, bonus: active state)

I'm getting more comfortable using grid. Also I spent time updating the readme.md file and I'm proud of it. I'd love to receive feedbacks on anything.

Some specific questions I have are: 1- any other way to make this design work? using grid or not using grid? 2- what would you do differently for the box-shadow, that makes it look closer to the design? 3- how do you like the active state that I added for the cards? :D

Happy coding!