tweak: use lighter underline

yyx990803 · yyx990803 · commit 236224df4cb8 · 2018-04-23T18:48:58.000-04:00
diff --git a/lib/default-theme/NavLinks.vue b/lib/default-theme/NavLinks.vue
@@ -129,5 +129,5 @@ export default {
   .nav-item > a
     &:hover, &.router-link-active
       margin-bottom -2px
-      border-bottom 2px solid $accentColor
+      border-bottom 2px solid lighten($accentColor, 8%)
 </style>
