Examples of websites using
FF Elementa
(FF Elementa is a sans-serif font designed by Mindaugas Strockis and released by FontFont in 1998. The font family consists of multiple styles, including regular, bold, italic, and condensed variants)
with
Helvetica
(Helvetica is a sans serif font designed by Max Miedinger, Linotype Design Studio, and released by Linotype in 1957. It is available in a wide range of styles and weights)