Customizing signup form, keep getting CORS error
I'm using the form action link (https://groups.io/g/GROUPNAME/signup?u=LONGNUMBER) for my own form that I built with Mobirise.
I keep getting a CORS issue when I use this link on my site, though when I use the given one under promote it seems to work fine. I just want the form to match the theme of my site, so I have differing HTML/CSS. What else does the form depend on so I can avoid the CORS issue?