diff --git a/index.html b/index.html
index 83c7193..81cec2a 100644
--- a/index.html
+++ b/index.html
@@ -449,7 +449,7 @@ <h1 style="text-align:center; padding: 10px 0; font-family: 'Lato', sans-serif;
         }
     }
 
-    window.addEventListener('load', function () {
+    document.addEventListener('DOMContentLoaded', function () {
         setThemeBasedOnSystemPreference();
 
         // Apply filter based on the URL parameter