diff --git a/packages/editor-ui/src/components/ExpressionEdit.vue b/packages/editor-ui/src/components/ExpressionEdit.vue
index 531874e4b8..bfbb0a5631 100644
--- a/packages/editor-ui/src/components/ExpressionEdit.vue
+++ b/packages/editor-ui/src/components/ExpressionEdit.vue
@@ -157,7 +157,7 @@ export default mixins(
 	padding: 1em 0 0.5em 1.8em;
 	border-top-left-radius: 8px;
 
-	background-color: $--custom-window-sidebar-top;
+	background-color: var(--color-background-base);
 	color: #555;
 	border-bottom: 1px solid $--color-primary;
 	margin-bottom: 1em;