JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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If you are using our Header field, you can simply inject the following custom CSS codes to your form to adjust the bottom margin:
Here's how you can inject the codes: http://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes. Just adjust the value if you need to. If you have some troubles doing it, let us know the form URL and we'll help you to add it.