Form to Salesforce with Javascript

Hello Everyone,

I’m trying to use this javascript code from GitHub, it grabs Webflows values from the form and sends it to salesforce. I am trying to implement this but nothing happens, maybe the onclick attribute is not firing. I did submit the form to salesforce with custom HTML form so it does work, but I need to use Webflows form because of the design and multistep form. Any idea of what is wrong?

Here is my site Read-Only: Link