diff --git a/simple-scrollbar.css b/simple-scrollbar.css
index 97c8774..e860c4c 100644
--- a/simple-scrollbar.css
+++ b/simple-scrollbar.css
@@ -12,7 +12,8 @@
   width: calc(100% + 18px);
   padding: 0 0 0 0;
   position: relative;
-  overflow: auto;
+  overflow-x: auto;
+  overflow-y: scroll;
   box-sizing: border-box;
 }