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diff --git a/src/_vars.scss b/src/_vars.scss
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+////
+/// Variables.
+///
+/// Global variables that are used throughout the framework.
+///
+/// @group Global variables
+///
+/// @access public
+////
+
+///
+/// Reference root font size in px that is used for px -> rem conversions.
+///
+/// @type number
+///
+$iro-root-size: 16px !default;