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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Are you referring where you can insert custom CSS in the new user interface? If yes, then please follow the steps below:
1. Click the "Preferences" button in the top toolbar.
2. Go to the "Form Styles" tab and then click "Custom CSS" tab. You can paste the CSS code in the textarea.
If this is not what you need then please let us know. Also, please provide more details about the problem. Thank you.