Responcive intro section with dropdown navigation

What challenges did you encounter, and how did you overcome them?

It was very challenging to make a markup for this one. I really tried to make it semantic and accessable as possible, but can`t say if i have done a good job or not. It would be lovely if you would take a glance at it and give me some feedback.

What specific areas of your project would you like help with?

Menu markup, positioning of the burger menu and its backdrop. I have tried to make it positioned absolute, but in this way, it was somehow ruining and destorting everything, overflowing body both in x and y axises