using variable for headlines

library/scss/_base.scss

@@ -105,7 +105,7 @@ H1, H2, H3, H4, H5 STYLES
 ******************************************************************/
 
 h1, .h1, h2, .h2, h3, .h3, h4, .h4, h5, .h5 {
-	font-family: sans-serif;
+	font-family: $sans-serif;
 	text-rendering: optimizelegibility;
 	font-weight: 500;
 	/*