I checked the published site, and in Chrome, I right click on the mouse on the page, and choose Inspect Element. From there I click the console tab, and I can see there is a script error, so that has to be fixed first:
In looking at the error, I can see that the script is trying to execute, before jQuery has loaded. I would move the custom code in your Header, to the Footer, because jQuery is loaded in the footer also, and any scripts in the Footer are executed after the jQuery has loaded.
I hope this helps. If not, please let me know – I’m happy to assist further!