Updated to system fonts

Author: AllThingsSmitty

css/grid.css

@@ -19,7 +19,15 @@
 body {
   background: #333;
   color: #666;
-  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
+  font-family: -apple-system, 
+    BlinkMacSystemFont, 
+    "Segoe UI", 
+    Roboto, 
+    Oxygen-Sans, 
+    Ubuntu, 
+    Cantarell, 
+    "Helvetica Neue", 
+    sans-serif;
   font-size: 100%;
   line-height: 1.5;
 }