Examples of websites using
Frank Ruhl Libre
(Frank Ruhl Libre is a serif font designed by Yanek Iontef and released in 2017. It is a revival and expansion of the original Frank-Rühl font. The family includes multiple weights and styles)
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)