diff --git a/addons/web/static/src/css/base.css b/addons/web/static/src/css/base.css
index 0008c763750..97bbb2b207c 100644
--- a/addons/web/static/src/css/base.css
+++ b/addons/web/static/src/css/base.css
@@ -2204,7 +2204,6 @@
 }
 .openerp .oe_form header {
   position: relative;
-  z-index: 1;
   border-bottom: 1px solid #cacaca;
   padding-left: 2px;
   background-color: #ededed;
diff --git a/addons/web/static/src/css/base.sass b/addons/web/static/src/css/base.sass
index baf0b720b60..e41a182407d 100644
--- a/addons/web/static/src/css/base.sass
+++ b/addons/web/static/src/css/base.sass
@@ -1748,7 +1748,6 @@ $sheet-padding: 16px
     // FormView.header {{{
     .oe_form header
         position: relative
-        z-index: 1
         border-bottom: 1px solid #cacaca
         padding-left: 2px
         @include vertical-gradient(#fcfcfc, #dedede)