Gradio 6 takes theme/css on launch()

app.py

@@ -963,7 +963,7 @@ EXAMPLES = [
     ],
 ]
 
-with gr.Blocks(title="H3-World", css=CSS, theme=gr.themes.Citrus()) as demo:
+with gr.Blocks(title="H3-World") as demo:
     gr.Markdown(INTRO)
 
     with gr.Row(equal_height=False):
@@ -1034,4 +1034,11 @@ with gr.Blocks(title="H3-World", css=CSS, theme=gr.themes.Citrus()) as demo:
 load_models()
 
 if __name__ == "__main__":
-    demo.launch(show_error=True, mcp_server=True, allowed_paths=[OUTPUT_DIR])
+    # Gradio 6 takes `theme` / `css` on `launch()`, not on the `Blocks` constructor.
+    demo.launch(
+        theme=gr.themes.Citrus(),
+        css=CSS,
+        show_error=True,
+        mcp_server=True,
+        allowed_paths=[OUTPUT_DIR],
+    )