Twitter Moments embedded widget scrollbar not present


Hello, we have generated an embed code for a Twitter Moments widget and embedded it as a block in our Drupal site - see left sidebar on this page:

Although the feed is working correctly, there is no scrollbar, so it has begun accumulating entries without scrolling. Source code (see below) indicates that scrollbar is set to “no” although we did not configure that (could not configure anything, just generate an embed code).

Can you offer any insight as to why we have no scrollbar and how we might be able to activate it?

Tom Connell
American Institute of Physics