Huddle landing page with a single introductory section

Here's my solution for this challenge. It's not perfect I have to admit. Even though I used grid I also used positioning properties what I really don't like. Also, the responsiveness is not very clean as I wished for. Maybe anyone can help me with this. Since I wanna succeed as many challenges as I can I move on to the next one. Maybe I'll come back later to this to fix it.