FF Mark in action on bauen-mit-carbon.net

Under the hood

.header-1 { font-family: MarkWeb-Bold; font-size: 30px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 24px; text-transform: none; color: #000000; }
.header-2 { font-family: MarkWeb-Book, sans-serif; font-size: 30px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 32px; text-transform: none; color: #58AEA9; }
.content-1 { font-family: MarkWeb-Book, sans-serif; font-size: 18px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 24px; text-transform: none; color: #000000; }

FF Mark is available from Fonts.com and MyFonts.