Hello first of all, really great job !
The website is responsive and work on phone and desktop that great but i have one problem. For my part i'm on a 21/9 screen and when the website is on fullscreen images are getting weird. Take a look on that.
And for the background of the header, i think you done a background linear top to bottom or something like that but try a left to right.
I'm french so sorry for my enflish.
Keep working on you code ! ;)
@YannisHaismann Thanks, I will work on that.