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.
Upon checking the forms you have recently edited I found that all of them have a white background, but this one http://www.jotform.us/form/61934766004154.
It currently has a box shadow effect:
To remove it you need to inject this CSS code:
box-shadow: none !important;
This guide will help you to inject the code o your form: How-to-Inject-Custom-CSS-Codes
However, you can provide us the link to the form you're currently editing, we will be glad to check it and find why the code is not working.
We will wait for your response.