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 want to disable the background, like this:
Inject the following CSS code as explained on this guide: http://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes
If you want to remove also the message "This field is required":
Also, include this code:
display: none !important;
Let us know if you need more help, we will be glad to assist you.