Update app.py

app.py

@@ -146,6 +146,7 @@ with gr.Blocks() as demo:
     <style>
         #api_key_button {
             margin-top: 27px; /* Add margin-top to the button */
+            background: linear-gradient(135deg, #4a00e0 0%, #8e2de2 100%); /* Purple gradient */
         }
     </style>
     """)