Update app.py

app.py

@@ -18,8 +18,7 @@ with gr.Blocks(
     css=".contain { display: flex !important; flex-direction: column !important; }"
     "#chatbot { flex-grow: 1 !important; overflow: auto !important;}"
     "#col { height: calc(100vh - 112px - 16px) !important; }",
-    theme=gr.themes.Default(primary_hue="green", 
-                            font=[gr.themes.GoogleFont("Martel Sans")])
+    theme=gr.themes.Base(font=[gr.themes.GoogleFont("Martel Sans")])                   
 ) as demo:
     gr.Markdown("# GPT4All Chatbot")
     with gr.Row():