Responsive page using grid layout and flexbox

Hello everyone, I've been away these days, but I accepted this challenge a week ago. I started the same day I took it, but it took me a few days to finish because I was on another project. anyway, when I returned to this challenge I was a little lost and ended up doing some "workarounds" to make it work. I hope you like my solution, but I'm sure I'll be refactoring this code in the future. Feedback is welcome, thank you. See you all later