Avenir with Tiempos in action on hioscar.com

Under the hood

.header-1 { font-family: tiempos-semibold, serif; font-size: 52px; font-style: normal; font-weight: normal; letter-spacing: 0px; line-height: 58px; text-transform: none; color: #000000; }
.content-1 { font-family: avenir-light, Helvetica, sans-serif; font-size: 25px; font-style: normal; font-weight: normal; letter-spacing: 0px; line-height: 38px; text-transform: none; color: #0033DD; }
.content-2 { font-family: avenir-regular, Helvetica, sans-serif; font-size: 18px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-transform: none; color: #0033DD; }
.content-3 { font-family: avenir-light, Helvetica, sans-serif; font-size: 18px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-transform: none; color: #001837; }
.content-4 { font-family: avenir-semibold, Helvetica, sans-serif; font-size: 17px; font-style: normal; font-weight: normal; letter-spacing: 0px; line-height: 20px; text-transform: none; color: #FFFFFF; background-color: #26CFA2; }

Avenir is available from Fonts.com and MyFonts.