diff --git a/packages/theme-default/src/select.css b/packages/theme-default/src/select.css
index 8f7cb9180..00d9ec31e 100644
--- a/packages/theme-default/src/select.css
+++ b/packages/theme-default/src/select.css
@@ -107,7 +107,7 @@
       position: absolute;
       line-height: normal;
       white-space: normal;
-      z-index: var(--index-top);
+      z-index: 1;
       top: 50%;
       transform: translateY(-50%);
     }