it appears to be using Infima, which is Docusaurus's default CSS framework plus a standard system font stack [0] font-family: -apple-system, BlinkMacSystemFont

it appears to be using Infima, which is Docusaurus's default CSS framework plus a standard system font stack [0] font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;