Update app.py

app.py

@@ -27,7 +27,7 @@ def tts(text, model, voice):
 
 with gr.Blocks() as demo:
     gr.Markdown("# <center> OpenAI Text-To-Speech API </center>")
-    gr.Markdown("## <center> Enter fewer than 4096 characters </center>")
+    gr.Markdown("<center> Enter fewer than 4096 characters </center>")
     with gr.Row():
       model = gr.Dropdown(choices=['tts-1-1106','tts-1-hd-1106'], label='Model', value='tts-1-1106')
       voice = gr.Dropdown(choices=['alloy', 'echo', 'fable', 'onyx', 'nova', 'shimmer'], label='Voice Options', value='alloy')