Open Sans font (Sans Serif font) pairing with Cooper BT font (Serif font)

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 Cooper BT (Cooper BT is a serif font designed by Oswald Bruce Cooper and released by Bitstream in 1920. The family includes a variety of weights and styles)