diff --git a/index.html b/index.html
index 6f0d730..92f6814 100644
--- a/index.html
+++ b/index.html
@@ -4,7 +4,7 @@
     <script src="script.js"></script>
     <link rel="icon" type="image/png" href="https://i.imgur.com/O4AeOvI.png">
   </head>
-  <body onload="changePDF('chapter1')">
+  <body onload="changePDF('chapter1')" style="background-color: #585858;">
     <table width="100%" height="100%">
       <tr width="100%" height="100%">
       <td width="10%">
