diff --git a/addons/website/static/src/css/editor.css b/addons/website/static/src/css/editor.css
index 34ba38db366..062010ae5c3 100644
--- a/addons/website/static/src/css/editor.css
+++ b/addons/website/static/src/css/editor.css
@@ -632,8 +632,7 @@ ul.oe_menu_editor .disclose {
 }
 .oe_ace_view_editor.oe_ace_closed {
   z-index: -1000;
-  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0);
-  opacity: 0;
+  display: none
 }
 
 .oe_include_bundles {
diff --git a/addons/website/static/src/css/editor.sass b/addons/website/static/src/css/editor.sass
index 9110b4454cd..db7cb63bc20 100644
--- a/addons/website/static/src/css/editor.sass
+++ b/addons/website/static/src/css/editor.sass
@@ -542,7 +542,7 @@ $infobar_height: 20px
         +opacity(0.97)
     &.oe_ace_closed
         z-index: -1000
-        +opacity(0)
+        display: none
 
 .oe_include_bundles
     font-weight: normal