Examples of websites using
Acier
(designed by Adolphe Mouron Cassandre and Jean-Baptiste Levée and released by Deberny & Peignot in 1930)
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)