diff --git a/assets/styles/tools/_functions.scss b/assets/styles/tools/_functions.scss
index d962919..8609d3e 100644
--- a/assets/styles/tools/_functions.scss
+++ b/assets/styles/tools/_functions.scss
@@ -48,17 +48,6 @@
     @return math.div($size, $base) * 1rem;
 }
 
-// Converts a number to a percentage.
-//
-// @alias  percentage()
-// @link   http://sassdoc.com/annotations/#alias
-// @param  {Number} $number - The value to convert.
-// @return {Number} A percentage.
-
-@function span($number) {
-    @return percentage($number);
-}
-
 // Checks if a list contains a value(s).
 //
 // @link   https://github.com/thoughtbot/bourbon/blob/master/core/bourbon/validators/_contains.scss