Style primary navigation

Adding styles and interaction patterns based on community
approved design proposals.

Signed-off-by: Yoshie Muranaka <yoshiemuranaka@gmail.com>
Signed-off-by: Derick Montague <derick.montague@ibm.com>
Change-Id: Ie7f422db6fbbca2033e10d2d2ae331540a8a038a
diff --git a/src/router/index.js b/src/router/index.js
index 61cb902..71b90fb 100644
--- a/src/router/index.js
+++ b/src/router/index.js
@@ -52,7 +52,7 @@
 const router = new VueRouter({
   base: process.env.BASE_URL,
   routes,
-  linkExactActiveClass: 'nav__link--current'
+  linkExactActiveClass: 'nav-link--current'
 });
 
 router.beforeEach((to, from, next) => {