Cute technical doc page - needs feedback

Alright, so the technical documentation page was harder to make in my own style but I did my best! I went the cute route with color and fonts to make it more interesting but still easy to read. Feedback on the sliding nav bar would be appreciated too (first one!) note- the sliding nav bar is only for smaller screens.

https://codepen.io/zaenaria/full/mZxBLy

Thanks!

Good job on cute! keep up the good work.