My HTML-template was not accepted and I received a hard-reject

Hi, my template was not accepted and I received a hard-reject. In general, I understand what the problem is and I know what to change, but I would like to hear the opinion of people who understand this better than me. I would be very grateful for your help.
Here is the link:

Useful Resources:

Hi there,
first thing to change is the typography

Thanks for your feedback. If I understand you correctly, is it about the readability of the font and its size?

Yes everything related to the font.