i used 'display flex', 'floats' '::after', 'nth-child()'

hey guys so i had some difficulties and i still don't know for sure if what i did is good enough, the 'mobile' responsive part i think is fine, but i had difficulty in the 'desktop' part where i couldn't put one next to it on the other in a correct way, I used 'float' and 'padding' to make it closer. My biggest difficulty was just the responsiveness of the 'desktop' itself, I started in this area 1 month ago.