Under the hood
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.header-1 {
font-family: proxima-nova, sans-serif;
font-size: 60px;
font-style: normal;
font-weight: 100;
letter-spacing: normal;
line-height: normal;
text-transform: none;
color: #2F353B;
}
Proxima Nova is available from Adobe Fonts, Fonts.com, Fontspring, MyFonts, Typekit and YouWorkForThem.