Huddle Landing Page With Alternating Feature Blocks

Hi, this was my first time trying out a junior project and I struggled a bit with it. Mostly trying to position the little card (advertisement) just before the footer and make it responsive but managed to find something to make it work (would love to hear if it's a good solution or if there is something better that can be done), Also laying out the footer itself especially on the desktop design was a bit challenging. I think my CSS for it is a little redundant but i guess it works. Finally the social icons aren't displayed in the center of their borders in my GitHub pages deployment but are centered on my vs code live server and I couldn't find a way to fix it. Would love to hear any feedback on how I can improve my code further! Thanks!