Proxima Nova in action on rumuki.com

• .header-1 { font-family: proxima-nova, "Helvetica Neue", Helvetica, Roboto, Arial, sans-serif; font-size: 32px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 45px; text-transform: none; color: #FFFFFF; }
• .content-1 { font-family: proxima-nova, "Helvetica Neue", Helvetica, Roboto, Arial, sans-serif; font-size: 18px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 31px; text-transform: none; color: #DEDEDE; }

Proxima Nova is available from Adobe Fonts, Fonts.com, Fontspring, MyFonts, Typekit and YouWorkForThem.