Responsive page using Grid and Flexbox ( with tablet version )

I'm fine with my project, I had some problems when I was doing the responsive part of it but when I understood what was wrong, it became easier. I've tried to make it look as similar as I could from the original one but I didn't spend much time trying to make it because I believe that the importance of doing the projects is much more on the concepts we use to make it work than the similarity between them. I've also made a tablet version because I took this idea from one of you guys here and I tried to make it in my own way. Anyone who has any idea of how I can make my project get better is more than welcome!.