diff --git a/static/webui/index.html b/static/webui/index.html
index 55676cd8..88329695 100644
--- a/static/webui/index.html
+++ b/static/webui/index.html
@@ -1,5 +1,8 @@
 <!doctype html>
-<html lang="en" data-bs-theme="dark">
+<html lang="en">
+<script>
+    document.documentElement.setAttribute("data-bs-theme", localStorage.getItem("theme") || "dark");
+</script>
 <head>
     <title>OpenWF WebUI</title>
     <meta name="viewport" content="width=device-width, initial-scale=1" />
