Move css from launch() to gr.Blocks(css=css)

Gradio 5+ requires css to be passed to gr.Blocks(), not launch().
Passing it to launch() caused the custom styles to not be applied.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app.py

@@ -955,7 +955,7 @@ CLEAR_SVG = '<svg class="tb-svg" viewBox="0 0 24 24" fill="none" stroke="current
 
 FIRE_LOGO_SVG = '<svg viewBox="0 0 24 24" fill="white" xmlns="http://www.w3.org/2000/svg"><path d="M12 23c-3.6 0-8-2.69-8-7.5 0-3.5 3-6.5 4.5-8 .27-.27.75-.08.75.28v2.44c0 .42.5.63.72.28C12.28 7.5 13 3 13 1c0-.42.48-.64.8-.35C18 4.5 20 9 20 12c0 5.5-3.5 11-8 11z"/></svg>'
 
-with gr.Blocks() as demo:
+with gr.Blocks(css=css) as demo:
 
     hidden_images_b64 = gr.Textbox(value="[]", elem_id="hidden-images-b64", elem_classes="hidden-input", container=False)
     prompt = gr.Textbox(value="", elem_id="prompt-gradio-input", elem_classes="hidden-input", container=False)