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 could disable the field as not being required in turn if the field is not filled out it will not show the red popup.
Now if you want to keep the required, you can also inject following CSS to your jotform and it will look like this http://form.jotformpro.com/form/42704139238959
CSS code used:
/* Fix Red Alert popup on the jotform to display nicer */
background: none !important;
background-color: transparent !important;
You can see here Inject Custom CSS Codes
You can also see here How to Clone an Existing Form from a URL above to your own account instead.
I did not remove the red background, but did remove the parts that were covering up the input fields.
Do let us know if you have any further questions.