JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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.
Forms created at JotForm are mobile responsive by default. If you want your form to be fully mobile responsive across different devices, there's no need to inject custom CSS codes into your form (unless it is necessary to correct something). Follow these steps instead:
a. While on the form builder, click the “Designer” icon to open the Form Designer
b. Click Form Layout on the right panel and check “Make this form responsive”.
This will make your form fully mobile responsive.
Hope this helps!