update variable to mktg

Author: broccolini

src/marketing/buttons/button.scss

@@ -34,8 +34,8 @@
 }
 
 .btn-primary-mktg {
-  background-color: $green-450;
-  border-color: $green-450;
+  background-color: $green-mktg;
+  border-color: $green-mktg;
 
   &:hover {
     background-color: $green-500;