cover image size reduced

app.py

@@ -34,9 +34,12 @@ demo = gr.Blocks()
 with demo:
     gr.Markdown(
         """
-    ![cover](https://huggingface.co/spaces/Gradio-Blocks/RickandMorty-BlockParty/resolve/main/img/img1.png){: .center-image, height="300px", width="300px"}
+    <center>    
+    <img src="https://huggingface.co/spaces/Gradio-Blocks/RickandMorty-BlockParty/resolve/main/img/img1.png" alt="dialog" width="250" height="250">
+    
     # Let's start the party with Rick & Morty
     Chat with Morty by typing in the input box below.
+    </center>
     """
     )