Update app.py

app.py

@@ -14,13 +14,20 @@ def CustomChatGPT(Question):
     ChatGPT_reply = response["choices"][0]["message"]["content"]
     messages.append({"role": "assistant", "content": ChatGPT_reply})
     return ChatGPT_reply
-
+    
+def set_theme(dark_theme):
+    if dark_theme:
+        return dark_theme_css
+    else:
+        return light_theme_css
+        
 demo = gr.Interface(
     fn=CustomChatGPT,
     inputs=gr.Textbox(label="Insert jargon here (ask a question):", placeholder="E.g. What are gas fees?"),
     outputs=gr.Textbox(label="Get a simple answer in return:"),
-    theme="grass",
-    title="Web(GPT)3"
+    gr.inputs.Checkbox(label="Dark Theme", default=False),
+    title="Web(GPT)3",
+    css=set_theme
     )
 
 demo.launch()