diff --git a/src/pages/04_product-service/MainPage.vue b/src/pages/04_product-service/MainPage.vue
index ae49da9f..563719f5 100644
--- a/src/pages/04_product-service/MainPage.vue
+++ b/src/pages/04_product-service/MainPage.vue
@@ -4098,7 +4098,7 @@ watch(
             flat
             square
             :class="{
-              ' surface-3': serviceTreeView,
+              'surface-3': serviceTreeView,
               'app-text-muted-2': serviceTreeView,
               'app-text-muted': !serviceTreeView,
             }"