diff --git a/index.html b/index.html
index 722fb16..6e30541 100644
--- a/index.html
+++ b/index.html
@@ -21,7 +21,7 @@
 
   <body>
     <div
-      class="w3-sidebar w3-bar-block w3-collapse w3-large"
+      class="w3-sidebar w3-bar-block w3-collapse w3-large  w3-flat-clouds"
       style="width: 300px; margin-top: 51px; padding-top: 12px"
       id="sidebar"
     >
