Understanding Gaussians

I like the font, images, and layout of this article. Does anyone happen to know if a tool (that I can also use) helped achieve this look?

Or if not, does anyone know how to reach the author? I may have missed it, but I didn't even see the author's name anywhere on the site.

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.

The CSS says:

    font-family: charter, Georgia, serif;

You can get a convenient copy of Charter here: https://practicaltypography.com/charter.html

Another free font based on (and largely identical to?) Charter is Charis: https://software.sil.org/charis/

The maths typeface is Neo-Euler: https://fontlibrary.org/en/font/euler-otf

Indeed. My mistake.

Thank you!