Update app.py

app.py

@@ -168,7 +168,7 @@ def load_javascript():
     
 def ui():
     load_javascript()
-    with gr.Blocks(title="NAI Client", theme=gr.themes.Base()) as website:
+    with gr.Blocks(title="NAI Client", theme=gr.themes.Base(), js="() => {document.body.classList.toggle('dark');}") as website:
         with gr.Tabs():
             with gr.TabItem("图片生成", elem_id="client_ui_main"):
                 _, paras = main_ui()