iframe doesn't display live

Site URL: https://takomaparkpc.squarespace.com/

I've added Custom Code with an iframe on the home page. It displays correctly in Edit mode, but becomes an empty box when live.  Could this be because it is in a column? Any other ideas?  We're running 7.1 with Premium Blocks.  Thank you! 

Code:

Edit:

Live:

Needs to be https://

Thank you! That worked.