diff --git a/html/index.html b/html/index.html
index d113c80f..635f2237 100644
--- a/html/index.html
+++ b/html/index.html
@@ -3,6 +3,7 @@
     <head>
         <meta charset="utf-8">
         <meta name="robots" content="noindex,nofollow">
+        <meta name="theme-color" content="rgb(49,123,249)">
         <!-- mobile first design -->
         <meta content="width=device-width,initial-scale=1" name="viewport">
         <link rel="icon" href="/favicon.ico" />
