diff --git a/src/app/index.tsx b/src/app/index.tsx
index 39f9ccc..481d141 100644
--- a/src/app/index.tsx
+++ b/src/app/index.tsx
@@ -14,7 +14,7 @@ function TimelineRedirect() {
 
 export default function App() {
   return (
-    <ThemeProvider defaultTheme="light">
+    <ThemeProvider defaultTheme="system">
       <BrowserRouter>
         <Routes>
           <Route path="/" element={<Page />} />