Under the hood
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.content-1 {
font-family: source-sans-pro, -apple-system, BlinkMacSystemFont, "segoe ui", roboto, oxygen, ubuntu, cantarell, "fira sans", "droid sans", "helvetica neue", helvetica, arial, sans-serif;
font-size: 16px;
font-style: normal;
font-weight: 400;
letter-spacing: normal;
line-height: 28px;
text-transform: none;
color: #222222;
}
Source Sans is available from Adobe Fonts, Font Squirrel, Google Web Fonts and Typekit.