Responsive social proof section page using Flexbox

Going into this, I was a bit intimidated because even if it is tagged as one for newbies, I had never done anything this big in the previous challenges I had taken. So, I approached it by dissecting the page into sections on paper before translating that to code. It worked and I don't think my code is perfect. This community has helped me improve tremendously and I would really appreciate any feedback on anything I can further improve in my code.

Thank you!