All solutions

My solutions looks great on my end, and in the DevTools responsive test. But when i upload the solution the proportions look insane. COuld it be the way i set up my queries?

Updated based on some feedback i received

When it comes to best practices, i know the roars of "mobile-first" will be echo'd through the industry...but what does that really mean? Any tips for how to start designing small, then making things "big"?