Fix header/footer navigation z-index

src/stylesheets/lungo.layout.nav.styl

@@ -18,11 +18,11 @@ nav
     width: 100%
     & > a
       box-flex(1)
+      text-decoration: none
 
   header &
     & a
       padding: 0px 11px !important
-      z-index: 1000
       float: left
 
     & .button, button

src/stylesheets/lungo.layout.styl

@@ -65,11 +65,10 @@ header, footer
     box-flex(0)
 
   & > .title
+    z-index: -1
     margin: 0 4px
     float: left
-    z-index: -1
     font-size: (FONT_SIZE_BIG * 1.2)
-    z-index: 0
     box-flex(1)
 
     &.centered