add the theme parameter

app.py

@@ -19,6 +19,7 @@ iface = gr.Interface(
 		title=title, 
 		description=description, 
 		inputs=[gr.inputs.Number(default=None, label="Age"), gr.inputs.Dropdown(["Female", "Male"], default="Male"), gr.inputs.Dropdown(["Asian", "Black", "Coloured", "White", "Other"], default="Asian"), gr.inputs.Dropdown(["1", "2"], default="1")], 
-		outputs="text")
+		outputs="text",
+		theme="darkdefault")
 		
 iface.launch()