diff --git a/index.html b/index.html
index 1e93d05..40a1458 100644
--- a/index.html
+++ b/index.html
@@ -2,6 +2,7 @@
 <html lang="en">
   <head>
     <meta charset="utf-8">
+    <meta name="color-scheme" content="light dark">
     <title>
       Navigation Timing Level 2
     </title>
