POST request form answer and css of questionnaire

I have to embed the form in our website, so I can see two ways of doing it.

Somehow changing CSS of the form to fit the rest of the website, this would be preferred, any way of doing this?

Or creating a custom form on our end and send a post request with the filled answers to your backend.

I see that the submit button makes a post request to can I send post requests to this URL? If so how? I looked into the documentation but didn't find anything.

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