Update app.py

app.py

@@ -89,14 +89,14 @@ r_tree = gr.Interface(
     fn=report_tree,
     inputs = file,
     outputs = cr_tree,
-    css="body {width: 100%; height: 100%; margin: 0; padding: 0;}"
+    css="body {background-color: #f5f5f5; width: 100%; height: 100%; margin: 0; padding: 0;}"
 )
 
 r_nn = gr.Interface(
     fn=report_nn,
     inputs = file,
     outputs = cr_nn,
-    css="body {width: 100%; height: 100%; margin: 0; padding: 0;}"
+    css="body {background-color: #f5f5f5; width: 100%; height: 100%; margin: 0; padding: 0;}"
 )
 
 #tree_interface.launch(inline=True)