Proxima Nova in action on zurb.com

Under the hood

.header-1 { font-family: 'Proxima Nova', Helvetica, Arial, sans-serif; font-size: 72px; font-style: normal; font-weight: bold; letter-spacing: normal; line-height: 100px; text-transform: none; color: #FFFFFF; }
.header-2 { font-family: 'Proxima Nova', Helvetica, Arial, sans-serif; font-size: 27px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 37px; text-transform: none; color: #FFFFFF; }
.content-1 { font-family: 'Proxima Nova', Helvetica, Arial, sans-serif; font-size: 20px; font-style: normal; font-weight: bold; letter-spacing: normal; line-height: 20px; text-transform: none; color: #FFFFFF; background-color: #8EA308; }