diff --git a/src/perfect-scrollbar.css b/src/perfect-scrollbar.css
index 06e4fd4..aa98c54 100644
--- a/src/perfect-scrollbar.css
+++ b/src/perfect-scrollbar.css
@@ -27,6 +27,7 @@
 }
 
 .ps-container .ps-scrollbar-x-rail.in-scrolling {
+    background-color: #eee;
     opacity: 0.9;
     filter: alpha(opacity = 90);
 }
@@ -60,6 +61,7 @@
 }
 
 .ps-container .ps-scrollbar-y-rail.in-scrolling {
+    background-color: #eee;
     opacity: 0.9;
     filter: alpha(opacity = 90);
 }