diff --git a/index.html b/index.html
index f4f40c2..14ee212 100644
--- a/index.html
+++ b/index.html
@@ -1,6 +1,12 @@
 <!doctype html>
 <html lang="en">
   <head>
+    <script>
+      // Avoid flickering on app start.
+      if (localStorage.getItem("theme") === "dark") {
+        document.documentElement.setAttribute("data-theme", "dark");
+      }
+    </script>
     <meta charset="UTF-8" />
     <link rel="icon" href="/radicle.svg" type="image/svg+xml" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
