Proxima Nova with Source Serif, with Source Sans and Alegreya in action on skyliner.io

Under the hood

.header-1 { font-family: "Proxima Nova", Verdana, sans-serif; font-size: 24px; font-style: normal; font-weight: bold; letter-spacing: normal; line-height: 24px; text-transform: none; color: #2A2D2F; }
.header-2 { font-family: "Source Serif Pro"; font-size: 75px; font-style: normal; font-weight: bold; letter-spacing: 0px; line-height: 90px; text-transform: none; color: #2A2D2F; }
.content-1 { font-family: "Proxima Nova", Verdana, sans-serif; font-size: 24px; font-style: normal; font-weight: bold; letter-spacing: normal; line-height: 24px; text-transform: none; color: #FFFFFF; background-color: #57D9B3; }