Update app.py

app.py

@@ -122,13 +122,14 @@ readme_html = """
 
 with gr.Blocks() as demo:
     gr.Markdown(
-            """
-            # Brain Tumor Segmentation Demo
-            
-            Powered by  [Tuba](https://Tuba.ai),
+        """
+        <div style="text-align: center;">
+            <h1>Brain Tumor Segmentation Demo</h1>
+            Powered by <a href="https://Tuba.ai">Tuba</a>
+        </div>
+        """
+    )
 
-            """
-        )
 
     # Define the input components and add them to the layout
     with gr.Row():