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

Examples of websites using Avenir (Avenir is a sans-serif font designed by Adrian Frutiger and Nadine Chahine, released by Linotype in 1988. It features clean and modern letterforms and is available in multiple weights and styles) 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)