Examples of websites using
Avenir
(Avenir is a sans-serif font designed by Adrian Frutiger and Nadine Chahine, released by Linotype in 1988. It features clean and modern letterforms and is available in multiple weights and styles)
with
Heldane
(Heldane is a serif font designed by Kris Sowersby and published by Klim Type Foundry. It was released in 2016 and features a wide range of styles including regular and fine optical sizes, each with varying weights and matching italics)