refactor(CSS): use font vars for base typography

Ryan A. Johnson · Ryan A. Johnson · commit d1d6943e9aad · 2018-03-19T17:07:41.000-05:00
* use variable to avoid potential bugs in future
diff --git a/src/helix-ui/styles/base/typography.less b/src/helix-ui/styles/base/typography.less
@@ -1,11 +1,11 @@
 html {
-  font-family: "Roboto", sans-serif;
+  font-family: @font-sans-serif;
   font-size: 16px;
 }
 
 body {
   color: @gray-900;
-  font-family: "Roboto", "Helvetica Neue", Helvetica, Arial, sans-serif;
+  font-family: @font-sans-serif;
   font-size: 1rem;
   font-weight: 400;
   line-height: 1.5;
