Thanks for your feedback. I made the blog template for Pelican fro scratch using Pico.css that I think work very well on mobile device. Can you check if you have the same issue also on their website ?
https://picocss.com/
Yes, it seems that there's a similar problem on that site.
Ok, thanks so it's a Pico.css issue , I'll try to reproduce and open an issue overt there.