What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Yes, that is possible. Here's an example form with those properties: http://www.jotformpro.com/form/42323266261953. This is using a custom CSS codes that will be injected to your form.
Get the custom CSS codes here: http://pastiebin.com/53f5e26d3fb5b. Simply replace all the URL's in the CSS by your own custom button. Also, you can adjust the height and widths as well as the border and submit text color.
Let us know if you need any further assistance.