small fix

app.py

@@ -49,13 +49,13 @@ with gr.Blocks(title="画像形式変換ツール") as demo:
     
     with gr.Row():
         with gr.Column():
+            convert_btn = gr.Button("変換する")
             output_format = gr.Dropdown(
                 choices=["png", "webp (lossless)", "jpeg", "webp (lossy)"],
                 value="webp (lossless)", 
                 label="変換後の形式"
             )
             quality = gr.Slider(0, 100, step=1, value=100, label="品質 (JPEG および WebP のみ)")
-            convert_btn = gr.Button("変換する")
             input_image = gr.Image(type="pil", label="入力画像", format="png")
         
         with gr.Column():