Responsive landing page. Semantic HTML, SCSS, Flebox and Javascript

Hello everyone!! This is my very first solution for frontendmentor, and in fact, the first page I code. Of course, I have build some little pieces of code, but never a whole structured page.

I would be very grateful for some feedback related to the order of the scss code, the html markups, and specially the structure from the header and navbar. It must be a better way to built the dropdowns behavior, and I'll improve that component in the near futur.

If you have some comment or advice, please let me know.

Thanks...