Check screen width before increasing max position

app/assets/javascripts/layout_nav.js.coffee

@@ -3,9 +3,7 @@ class @LayoutNav
     $('#scrolling-tabs').on 'scroll', ->
       currentPosition = $(this).scrollLeft()
       return if currentPosition == 0
-      if $('.nav-control').length
-        maxPosition = $(this)[0].scrollWidth - $(this).parent().width() + 59
-      else
-        maxPosition = $(this)[0].scrollWidth - $(this).parent().width()
+      maxPosition = $(this)[0].scrollWidth - $(this).parent().width()
+      maxPosition += 59 if $('.nav-control').length and window.innerWidth > 480
 
       $('.fade-out').toggleClass('end-scroll', currentPosition is maxPosition)