color buttons

app.py

@@ -241,8 +241,8 @@ with gr.Blocks(analytics_enabled=False) as demo:
         
     gr.Markdown("### Output")
     with gr.Row():
-        btn_start_pipeline = gr.Button(value="Run")
-        btn_stop_pipeline = gr.Button(value="Stop")
+        btn_start_pipeline = gr.Button(value="Run", variant="primary")
+        btn_stop_pipeline = gr.Button(value="Stop", variant="stop")
     with gr.Row():
         # out_result = gr.Textbox(label="Status", value="")
         out_image = gr.Image()