diff --git a/868-mhz/index.html b/868-mhz/index.html
index feb1bb6..dd1a532 100644
--- a/868-mhz/index.html
+++ b/868-mhz/index.html
@@ -11,6 +11,9 @@
 </head>
 
 <body>
+  <style>
+    #main{background-color: black;}
+  </style>
 <div id='wrapper'></div>
 <a href='../' id='homebttn' class='ext'> << home</a>
 <header>
