Adelle Sans with Adobe Caslon in action on talla.com

Under the hood

.header-1 { font-family: adelle-sans, "Helvetica Neue", Helvetica, Arial, sans-serif; font-size: 23px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 32px; text-transform: none; }
.header-2 { font-family: adelle-sans, "Helvetica Neue", Helvetica, Arial, sans-serif; font-size: 22px; font-style: normal; font-weight: 600; letter-spacing: 0px; line-height: 29px; text-transform: none; color: #FFFFFF; background-color: #34467E; }
.header-3 { font-family: adobe-caslon-pro, serif; font-size: 62px; font-style: normal; font-weight: 600; letter-spacing: 0px; line-height: 62px; text-transform: none; color: #FFFFFF; }