add focus/hover style for header links

themes/lumbung-theme/static/css/main.css

@@ -158,6 +158,11 @@ a {
   margin: 0 2rem;
 }
 
+#top-menu a:hover,
+#top-menu a:focus {
+  color: black;
+}
+
 #top-menu #login {
   font-weight: bold;
 }