diff --git a/index.html b/index.html
index 662a949..09e12ae 100644
--- a/index.html
+++ b/index.html
@@ -3,6 +3,7 @@
 <head>
   <title>Performance Timeline</title>
   <meta charset='utf-8'>
+  <meta name="color-scheme" content="light dark">
   <script src='https://www.w3.org/Tools/respec/respec-w3c' async class=
   'remove'></script>
   <script class='remove'>
