This PR adds color code for buttons

Add the feature of standard color code for the Start and the End buttons. It helps the users to understand how the space works.

Click on _Merge_ to add this feature.

app.py

@@ -441,8 +441,8 @@ adapted from the officical code repo [FramePack](https://github.com/lllyasviel/F
             example_quick_prompts.click(lambda x: x[0], inputs=[example_quick_prompts], outputs=prompt, show_progress=False, queue=False)
 
             with gr.Row():
-                start_button = gr.Button(value="Start Generation")
-                end_button = gr.Button(value="End Generation", interactive=False)
+                start_button = gr.Button(value="Start Generation", variant="primary")
+                end_button = gr.Button(value="End Generation", variant="stop", interactive=False)
 
             total_second_length = gr.Slider(label="Total Video Length (Seconds)", minimum=1, maximum=5, value=2, step=0.1)
             with gr.Group():