1 files changed, 26 insertions, 0 deletions
diff --git a/browser/themes/windows/customizableui/panelUI.css b/browser/themes/windows/customizableui/panelUI.css
new file mode 100644
index 0000000000..fc5f683dbe
--- /dev/null
+++ b/browser/themes/windows/customizableui/panelUI.css
@@ -0,0 +1,26 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+@import "chrome://browser/skin/customizableui/panelUI-shared.css";
+
+/* bookmark panel submenus */
+
+menupopup::part(drop-indicator) {
+  /* To account for the shadow margin + border of the panel */
+  margin-inline-start: 5px;
+}
+
+toolbarbutton menupopup[placespopup] {
+  --nested-margin: calc(-1 * (var(--arrowpanel-menuitem-padding-inline) + var(--panel-shadow-margin)));
+}
+
+@media not (-moz-windows-non-native-menus) {
+  toolbarbutton menupopup[placespopup] {
+    --panel-shadow-margin: 4px;
+  }
+
+  toolbarbutton menupopup[placespopup] menupopup[placespopup] {
+    margin-inline-start: var(--nested-margin);
+  }
+}