Examples of websites using
Arno
(Arno is a serif font designed by Robert Slimbach and released by Adobe in 2007. The font family includes a range of styles, with variations in weights and matching italics)
with
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)