Update app.py

app.py

@@ -153,7 +153,9 @@ def build_demo(embed_mode, concurrency_count=1):
                 f"""
                 <div style="text-align: center; margin-bottom: 20px;">
                     <!-- Image -->
-                    <img src="data:image/png;base64,{base64_image}" alt="ShowUI" width="320" style="margin-bottom: 10px;"/>
+                    <div style="display: flex; justify-content: center;">
+                        <img src="data:image/png;base64,{base64_image}" alt="ShowUI" width="320" style="margin-bottom: 10px;"/>
+                    </div>
             
                     <!-- Description -->
                     <p>ShowUI is a lightweight vision-language-action model for GUI agents.</p>