update variable name

Author: broccolini

src/marketing/support/variables.scss

@@ -22,7 +22,7 @@ $h000-size: 64px !default;
 $h000-size-mobile: 48px !default;
 
 // Colors
-$green-450: mix($green-500, $green-400, 50%);
+$green-mktg: mix($green-500, $green-400, 50%);
 $blue-mktg: mix($blue-400, $blue-500, 42%);
 
 // Animations