diff --git a/components/table/demo/resizable-column.md b/components/table/demo/resizable-column.md
index e904bd5c54..e13d4a7f03 100644
--- a/components/table/demo/resizable-column.md
+++ b/components/table/demo/resizable-column.md
@@ -131,5 +131,6 @@ ReactDOM.render(<Demo />, mountNode);
   bottom: 0;
   right: -5px;
   cursor: col-resize;
+  z-index: 1;
 }
 ```