Update app.py

app.py

@@ -22,6 +22,13 @@ def infer(
 ):
     return pipe(audio, generate_kwargs={'language': 'chinese'})['text']
 
+css = """
+#col-container {
+    margin: 0 auto;
+    max-width: 640px;
+}
+"""
+
 with gr.Blocks(css=css) as demo:
     gr.Markdown(" # PhonoLearn")
     input_audio = gr.Audio(