Examples of websites using
Source Sans Pro
(Source Sans Pro is a Sans Serif font designed by Paul D. Hunt. The font family includes six styles, each with regular, italic, bold, and bold italic variations, providing a versatile range of options for designers)
with
GT Sectra
(GT Sectra is a serif font designed by Marc Kappeler and Dominik Huber and released by Grilli Type in 2014. It is available in three optical sizes (Text, Display, and Micro) with a total of 24 individual styles)