Examples of websites using
Silk Serif
(Silk Serif is a serif font designed by Rakel Tómasdóttir and released by SilkType in 2017. The font family includes multiple styles and weights)
with
IBM Plex Sans
(IBM Plex Sans is a Sans Serif font designed by Mike Abbink of Bold Monday. The font family consists of multiple styles and variations, including regular and italics, and is available in a range of weights)