Nice! Great start. I like the overall feel.
One detail I caught is that sometimes the section title doesn’t seem well-balanced or centered with the below content (and one of the boxes seems to be popping out on top).
Whereas this one below the image centering is very clear
And in this shot below for my taste the
COURSES text dips in alignment in the center box. Which goes against the crispness theme that you have in general.
Maybe the github readme could just talk a little more about the motivation. You would have strangers or potential collaborators/employers see this first and a good readme file improves the whole experience and directs them to what is really interesting (you can even include your Colmar Academy link in the readme.
Have you seen Kevin Powell’s youtube channel on css? He has a lot of interesting ideas about ways to make sites look good. I haven’t done css in a while but I think he was pretty clear in his approach.