Open Sans font pairing with Big Caslon

Examples of websites using Open Sans (Open Sans is a sans-serif font designed by Steve Matteson. It offers a wide range of styles, including regular, italic, bold, bold italic, and light) with Big Caslon (Big Caslon is a serif font designed by Font Bureau. It has multiple styles, including regular, italic, bold, bold italic, and black)

Open Sans specimen
Big Caslon specimen