diff --git a/src/styles/globals.css b/src/styles/globals.css
index e4fa7ee..1199f98 100644
--- a/src/styles/globals.css
+++ b/src/styles/globals.css
@@ -23,6 +23,7 @@
   bottom: 0;
   left: 0;
   right: 0;
+  z-index: -10;
 }
 
 /* Customize website's scrollbar like Mac OS