You’ve got a good start here. Just need some tweaking.
First thing to change, in your HTML mark-up you have your navigation commented out.
<!-- nav -->. So your navigation is not showing up at all in your pen.
Secondly, there is a huge amount of white space at both the top and bottom of the page that only has “MC” showing in it. This is because the image you are trying to use is not being uploaded and we are only seeing the alt attribute for the image. Try hosting the images on cloudinary.com
I think once you correct these you will have met the challenge.