diff --git a/fastchat/utils.py b/fastchat/utils.py
index 1bf4a0601..7c0614e3e 100644
--- a/fastchat/utils.py
+++ b/fastchat/utils.py
@@ -193,9 +193,6 @@ def pretty_print_semaphore(semaphore):
 """A javascript function to get url parameters for the gradio web server."""
 get_window_url_params_js = """
 function() {
-    document.body.classList.toggle('dark');
-    document.body.classList.toggle('light');
-    document.querySelector('gradio-app').style.backgroundColor = 'var(--color-background-primary)';
     const params = new URLSearchParams(window.location.search);
     url_params = Object.fromEntries(params);
     console.log("url_params", url_params);