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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Please do the following:
1. Load the form in the form builder and click the Designer button:
2. Click the CSS tab:
3. Add the following rule to that tab's work area:
border: 2px solid red !important;
(Change the color to suit your preference.)
4. Save the change:
If you need further assistance with this or anything else, please inform us.