diff --git a/src/vs/workbench/contrib/preferences/browser/keybindingsEditor.ts b/src/vs/workbench/contrib/preferences/browser/keybindingsEditor.ts
index c7c5e722f4f..1767dd96079 100644
--- a/src/vs/workbench/contrib/preferences/browser/keybindingsEditor.ts
+++ b/src/vs/workbench/contrib/preferences/browser/keybindingsEditor.ts
@@ -305,7 +305,7 @@ export class KeybindingsEditor extends EditorPane implements IKeybindingsEditorP
 	private createOverlayContainer(parent: HTMLElement): void {
 		this.overlayContainer = DOM.append(parent, $('.overlay-container'));
 		this.overlayContainer.style.position = 'absolute';
-		this.overlayContainer.style.zIndex = '10';
+		this.overlayContainer.style.zIndex = '40'; // has to greater than sash z-index which is 35
 		this.defineKeybindingWidget = this._register(this.instantiationService.createInstance(DefineKeybindingWidget, this.overlayContainer));
 		this._register(this.defineKeybindingWidget.onDidChange(keybindingStr => this.defineKeybindingWidget.printExisting(this.keybindingsEditorModel!.fetch(`"${keybindingStr}"`).length)));
 		this._register(this.defineKeybindingWidget.onShowExistingKeybidings(keybindingStr => this.searchWidget.setValue(`"${keybindingStr}"`)));