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
Plain
('Plain' is a sans-serif font designed by François Rappo and released by Optimo in 2013. The family consists of 11 individual styles, including regular, italic, and bold weights)