Avenir in action on atomiks.github.io

.header-1 { font-family: Avenir, -apple-system, system-ui, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif; font-size: 28px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 30.8px; text-transform: none; color: #CAD6E6; }
.header-2 { font-family: Avenir, -apple-system, system-ui, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif; font-size: 28px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 30.8px; text-transform: none; color: #CAD6E6; }
.content-1 { font-family: Avenir, -apple-system, system-ui, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif; font-size: 16px; font-style: normal; font-weight: 600; letter-spacing: normal; line-height: 24px; text-transform: none; color: #FFFFFF; }
.content-2 { font-family: Avenir, -apple-system, system-ui, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif; font-size: 17px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 25.5px; text-transform: none; color: #CAD6E6; }
Avenir is available from Fonts.com, Fontshop and MyFonts.
Found by @mikesten on 27 Feb 2017.

Liked by:
@mikesten

Avenir