Update

app.py

@@ -88,7 +88,8 @@ with gr.Blocks(css="style.css") as demo:
         label='AnimateDiff-Lightning',
         autoplay=True,
         height=512,
-        width=512
+        width=512,
+        elem_id="video_output"
     )
 
     prompt.submit(

style.css

@@ -1,3 +1,7 @@
 .gradio-container {
-    max-width: 690px !important;
+    max-width: 800px !important;
+}
+
+#video_output {
+    margin: 0 auto
 }