diff --git a/addons/web/static/src/css/base.css b/addons/web/static/src/css/base.css
index 82230667e3a..01ff07a27ae 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");
@@ -2096,12 +2096,13 @@
   color: #333333;
 }
 
-.openerp.kitten-mode-activated {
+.kitten-mode-activated {
   background-image: url(http://placekitten.com/g/1365/769);
   background-size: cover;
+  background-attachment: fixed;
 }
-.openerp.kitten-mode-activated > * {
-  opacity: 0.65;
+.kitten-mode-activated > * {
+  opacity: 0.7;
 }
 
 .openerp .oe_form_field_many2one td:first-child {
diff --git a/addons/web/static/src/css/base.sass b/addons/web/static/src/css/base.sass
index cf025bd03d4..1c5ffe27481 100644
--- a/addons/web/static/src/css/base.sass
+++ b/addons/web/static/src/css/base.sass
@@ -1727,11 +1727,12 @@ $colour4: #8a89ba
         color: #333
     // }}}
 
-.openerp.kitten-mode-activated
+.kitten-mode-activated
     background-image: url(http://placekitten.com/g/1365/769)
     background-size: cover
+    background-attachment: fixed
     >*
-        opacity: 0.65
+        opacity: 0.70
 
 // Transitional overrides for old styles {{{
 .openerp
diff --git a/addons/web/static/src/js/chrome.js b/addons/web/static/src/js/chrome.js
index eb2dcad8624..57cab0b6989 100644
--- a/addons/web/static/src/js/chrome.js
+++ b/addons/web/static/src/js/chrome.js
@@ -846,7 +846,7 @@ instance.web.WebClient = instance.web.Widget.extend({
         var self = this;
         this.$element.addClass("openerp openerp-web-client-container");
         if (jQuery.param !== undefined && jQuery.deparam(jQuery.param.querystring()).kitten !== undefined) {
-            self.$element.addClass("kitten-mode-activated");
+            $("body").addClass("kitten-mode-activated");
             self.$element.delegate('img.oe-record-edit-link-img', 'hover', function(e) {
                 self.$element.toggleClass('clark-gable');
             });