[FIX] web: correct navbar position

bzr revid: chs@openerp.com-20140213142643-y0wtmbv3fzh8f0wt

addons/web/static/src/css/base.css

@@ -3025,7 +3025,8 @@
   min-height: 32px;
   margin-bottom: 0px;
   border: none;
-  z-index: 0;
+  z-index: 1;
+  position: static;
   background-color: #414141;
   background-color: #454343;
   background-image: -webkit-gradient(linear, left top, left bottom, from(#646060), to(#262626));

addons/web/static/src/css/base.sass

@@ -2425,7 +2425,8 @@ $sheet-padding: 16px
         min-height: 32px
         margin-bottom: 0px
         border: none
-        z-index: 0
+        z-index: 1
+        position: static
         background-color: #414141
         @include vertical-gradient(#646060, #262626)
     .navbar-default