Remove large border from embedded form

I've really tried to work this out myself but not managed at all. I want to embed this into Wix and have followed the instructions but it leaves a large border on the form which I really don't want. How can I adjust the settings so that only the darker blue box appears with the submit button? Thank you all so much. Sam

Could you please try the iFrame method of embedding your form.

Getting-the-Form-iFrame-Code

Let us know how this goes.

Thanks.