diff --git a/addons/web/static/src/css/base.css b/addons/web/static/src/css/base.css
index 35b6fcc582d..c5c9af94479 100644
--- a/addons/web/static/src/css/base.css
+++ b/addons/web/static/src/css/base.css
@@ -1,4 +1,4 @@
-@charset "UTF-8";
+@charset "utf-8";
 @font-face {
   font-family: "mnmliconsRegular";
   src: url("/web/static/src/font/mnmliconsv21-webfont.eot") format("eot");
@@ -3025,7 +3025,7 @@
   min-height: 32px;
   margin-bottom: 0px;
   border: none;
-  z-index: 1;
+  z-index: 0;
   background-color: #414141;
   background-color: #454343;
   background-image: -webkit-gradient(linear, left top, left bottom, from(#646060), to(#262626));
diff --git a/addons/web/static/src/css/base.sass b/addons/web/static/src/css/base.sass
index 5021644a062..95c30e5dc93 100644
--- a/addons/web/static/src/css/base.sass
+++ b/addons/web/static/src/css/base.sass
@@ -2425,7 +2425,7 @@ $sheet-padding: 16px
         min-height: 32px
         margin-bottom: 0px
         border: none
-        z-index: 1
+        z-index: 0
         background-color: #414141
         @include vertical-gradient(#646060, #262626)
     .navbar-default