Under the hood
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.header-1 {
font-family: adelle, serif;
font-size: 48px;
font-style: normal;
font-weight: 100;
letter-spacing: normal;
line-height: normal;
text-transform: none;
color: #2C2C2C;
}
Adelle is available from Adobe Fonts, Fonts.com, MyFonts and Typekit.