diff --git a/packages/overlay/src/index.vue b/packages/overlay/src/index.vue
index 81e18b9b6a..4538236c96 100644
--- a/packages/overlay/src/index.vue
+++ b/packages/overlay/src/index.vue
@@ -66,6 +66,7 @@ export default defineComponent({
         : h(
           'div',
           {
+            class: props.overlayClass,
             style: {
               zIndex: props.zIndex,
               position: 'fixed',