diff --git a/public/index.html b/public/index.html
index d0b315d..2d64793 100644
--- a/public/index.html
+++ b/public/index.html
@@ -72,7 +72,7 @@
     <!-- /Yandex.Metrika counter -->
   </head>
 
-  <body>
+  <body class="bg-dark">
     <div id="loader"></div>
 
     <button type="button" class="btn btn-danger btn-floating btn-lg" id="btn-back-to-top">
