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.
You cannot change the background in the Designer, but it's working fine in the Form Style tab.
Let me forward this matter to our developers for them to check further. If there are updates, you should know it through this thread.
We are sorry for trouble that caused to you. It is fixed now.
Please let me know if you need any further information.