Examples of websites using
Lato
(Lato is a sans-serif font designed by Łukasz Dziedzic and released by tyPoland in 2010. The font family consists of two styles, regular and bold, with each style available in a wide range of weights and matching italics)
with
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)