Examples of websites using
Source Serif
(Source Serif is a serif font designed by Frank Grießhammer. It offers multiple styles and weights, providing a versatile range of options for various design needs)
with
DM Sans
(DM Sans is a versatile sans-serif font designed by Colophon Foundry, Jonny Pinhorn, and Indian Type Foundry. The font family consists of multiple styles, including regular and italics, with a wide range of weights available)