3 cards component using CSS flexbox and @media

Hello everyone! This is my very first challenge here on FrontEnd Mentor! I'm very happy to finally posting this. I put some time on it since I had to practice a lot with flexbox, responsive design and also Github. I'd be very glad to know all your feedback! Please bare with me, it's my first attempt! :) If you all have some suggestions of any kind I'd be happy to know ! Mostly about the responsive design, and my github repository overall.