Four card feature section Flex/Grid mix

What are you most proud of, and what would you do differently next time?

It was my first time with grid, i learn basic from free resources, it's much complicated compared to flex, but I'm sure, Ill can learn it easily. It's also my first time with variblaes, it's very handy and I will use it on dailt basis from now.

What challenges did you encounter, and how did you overcome them?

The hardest thing for me was the struggle to arrange the objects on the cards correctly, as shown in the screenshots.

What specific areas of your project would you like help with?

I had problem with responsiveness of site. After some trial and error fun with code I finally created page similar to screenshots BUT I have one question. During coding I had conception to make cards first next to each other i columns, like on mobile screen, then move them in two columns of two cards, one under the other, and then add proper look from deskop screen. With grid I wasn't able to reach that effect. because grid lines makes it impossible. How can i place object in grid in the middle of line? I was thinking about creating separate code in HTML for @media to use flex and another one for grid, and hide previous with display:none;. How can I do it without repeating code?