Today I learned there's a CSS property for styling the first letter of a paragraph, neat. (https://css-tricks.com/almanac/properties/i/initial-letter/)

--edit: The font used for those initials is called Goudy Initialen: https://www.dafont.com/goudy-initialen.font

Technically "it depends on the browser settings," but the body font Alegreya is served directly by the site, so I think it would be the one used in almost all cases.

The math fonts used in the formulas are just the ones provided by KaTeX, which I think are just TeX's default math fonts.

Already replied :)

The source code of the website is open if you wanna check it out!

That font, and how it's integrated with the math looks amazing. Katex for the math?

Inspection suggests "https://online-fonts.com/fonts/alegreya"

Alegreya