added navigation style changes to responsive design

public/css/main.css

@@ -193,7 +193,7 @@ footer .skype {
         font-size: 2.5em;
         line-height: 1.125;
     }
-    h2 {
+    h2, nav li {
         font-size: 2em;
         line-height: 1.25;
     }
@@ -214,7 +214,7 @@ footer .skype {
         font-size: 3em;
         line-height: 1.05;
     }
-    h2 {
+    h2, nav li {
         font-size: 2.25em;
         line-height: 1.25;
     }