PD. I think I’ll leave my solutions without the corrections, that way (in this assesment and the other one I worked “Assesment wanted for marking up a letter HTML”) new people can see the mistakes that justsomeone and Pablo_Duran appointed.
remember that better to use the nav element only once per page to respect the semantic.
Also to include an image into codepen, can do by uploading to Google photo > right click> select copy image address> use any url shortner.
Note: In this perticular image the image is black and background( of Google photo) is also black. So, just right click at the center.
I have done this and the result is after forking @infelipo pen . https://codepen.io/rajan/full/NWrRQGd