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I am looking at this form: http://www.jotform.me/form/51170824288457
Now this would not be possible at this time because the widget does not have a custom CSS option that would allow us to modify any part of it and since it is loaded through the iframe, that would be the only way to do this.
I will raise this to our team working on widgets to see if it would be possible to add the custom CSS option for this widget as well.
Once there are any news in regards to this, you will be updated about it through this thread.
I have moved your question to this thread, since this is old: http://www.jotform.com/answers/774914.
We will answer there.