Source Sans Pro in action on verytinymachines.com

.header-1 { font-family: 'Source Sans Pro', sans-serif; font-size: 47.5px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 68.4px; text-transform: none; color: #FFFFFF; }
.header-2 { font-family: 'Source Sans Pro', sans-serif; font-size: 19px; font-style: normal; font-weight: 600; letter-spacing: normal; line-height: 30.875px; text-transform: none; color: #FFFFFF; }
.content-1 { font-family: 'Source Sans Pro', sans-serif; font-size: 19px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 30.875px; text-transform: none; color: #FFFFFF; }
.content-2 { font-family: 'Source Sans Pro', sans-serif; font-size: 19px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 30.875px; text-transform: none; color: #FFFFFF; }
Source Sans Pro is available from Font Squirrel, Google Web Fonts and Typekit.

Try this combination out in Pair and Compare.
Found by @mikesten on 5 Apr 2016.

Liked by:
@mikesten @Jimmy_Franko

Source Sans Pro