diff --git a/addons/web/static/src/css/base.css b/addons/web/static/src/css/base.css
index edd4d4869a5..fabb8503b34 100644
--- a/addons/web/static/src/css/base.css
+++ b/addons/web/static/src/css/base.css
@@ -623,6 +623,10 @@
   display: block;
   color: gray;
 }
+.openerp .ui-tabs .oe_notebook.ui-tabs-nav li.ui-tabs-active { 
+  border-bottom: none;
+  padding-bottom: 1px;
+}
 .openerp .oe_notebook > li.ui-tabs-active > a {
   color: #4c4c4c;
 }
diff --git a/addons/web/static/src/css/base.sass b/addons/web/static/src/css/base.sass
index 4814e64c590..c54cd2920c0 100644
--- a/addons/web/static/src/css/base.sass
+++ b/addons/web/static/src/css/base.sass
@@ -561,6 +561,9 @@ $sheet-padding: 16px
         text-decoration: none
         background-color: #eee
         border-color: #eee #eee #ddd
+    .ui-tabs .oe_notebook.ui-tabs-nav li.ui-tabs-active
+        border-bottom: none
+        padding-bottom: 1px
     .oe_notebook > li.ui-state-active > a, .oe_notebook > li.ui-state-active > a:hover
         background-color: #ffffff
         border: 1px solid #ddd