Examples of websites using
Untitled Sans
(Untitled Sans is a sans-serif font designed by Klim Type Foundry and released in 2017. The font family consists of 10 styles, including regular and italic styles, available in various weights and widths)
with
PT Serif
(PT Serif is a serif font designed by ParaType. The font family consists of multiple styles, including regular and italic, and is suitable for various projects)