Fix #581

sass/components/nav.sass

@@ -72,8 +72,6 @@ a.nav-item
 
 .nav-left
   justify-content: flex-start
-  overflow: hidden
-  overflow-x: auto
   white-space: nowrap
 
 .nav-right
@@ -104,8 +102,6 @@ a.nav-item
         padding: 0.75rem
       &.is-active
         display: block
-  +tablet-only
-    padding-right: 1.5rem
 
 // Main container
 
@@ -121,10 +117,7 @@ a.nav-item
     align-items: stretch
     display: flex
     min-height: $nav-height
+    width: 100%
   // Modifiers
   &.has-shadow
     box-shadow: 0 2px 3px rgba($black, 0.1)
-  // Responsiveness
-  +mobile
-    & > .container
-      width: 100%