huddle-landing-page with CSS from scratch

Hi guys, I would be grateful for any kind of suggestion that could make me improve my coding skills.

When I read my code, I feel that it is not very flexible because I used a lot of margins and paddings. Maybe I could improve the flexibility of my boxes if I had used calc values for my margins, paddings and my typography.

Another problem I ran into was importing icons from "icon-awesome" and I still don't know how to import them although I would like to. The reason I would prefer to use the icons from icon-awesome is that I am not satisfied with the browsers support of the icons I imported into this project and maybe the icons of icon-awesome have a better browser support

I also think I need to learn BEM and improve my problem solving skills to be faster at coding.

Any ideas that could help me in the topics I wrote here are welcome.

Good coding

Christ