Source Sans Pro in action on coglode.com

Under the hood

.header-1 { font-family: 'Source Sans Pro', Avenir, HelveticaNeue, sans-serif; font-size: 40px; font-style: normal; font-weight: 600; letter-spacing: -1px; line-height: 45px; text-transform: none; color: #FFFFFF; }
.header-2 { font-family: 'Source Sans Pro', Avenir, HelveticaNeue, sans-serif; font-size: 18px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 27px; text-transform: none; color: #FFFFFF; }
.content-1 { font-family: 'Source Sans Pro', Avenir, HelveticaNeue, sans-serif; font-size: 18px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 27px; text-transform: none; color: #FFFB9F; }
.content-2 { font-family: 'Source Sans Pro', Avenir, HelveticaNeue, sans-serif; font-size: 12px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 18px; text-transform: none; }