app fixes

app.py

@@ -444,9 +444,9 @@ footer span,
 }
 """
 
-demo = gr.Blocks(css=custom_css)
-
-with demo:
+with gr.Blocks() as demo:
+    # Inject CSS manually (gradio 6.0.2 removed the `css` kwarg on Blocks)
+    gr.HTML(f"<style>{custom_css}</style>")
     # Header
     gr.HTML("""
         <div style="text-align: center; margin-bottom: 20px;">