Update app.py

app.py

@@ -20,7 +20,7 @@ css = """\
   font-size: 2em;
 }
 .choices-group .wrap label:first-child {
-  background: #c89834;
+  background: #c39f53;
 }
 .choices-group .wrap label:last-child {
   background: #24a6e1;