Update app.py

app.py

@@ -35,6 +35,6 @@ gr_interface = gr.Interface(
     description="This RetinaNet model counts microalgaes on a given image. Upload an image or click an example image below to use.",
     article="<p style='text-align: center'><a href='https://dicksonneoh.com/' target='_blank'>Blog post</a></p>",
     examples=examples,
-    theme="grass",
+    theme="dark-grass",
 )
 gr_interface.launch()