The author is Peter Bloem, and the html is compiled from these sources:
https://github.com/pbloem/gestalt.ink
with the help of mathjax: https://www.mathjax.org/
The font seems to be Georgia.
with the help of mathjax: https://www.mathjax.org/
The font seems to be Georgia.
font-family: charter, Georgia, serif;
Another free font based on (and largely identical to?) Charter is Charis: https://software.sil.org/charis/