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.
Unfortunately JotForm does not support "@import" in injecting CSS code. However, JotForm supports css "@media" and "@font-face" rules.
You might want to try putting that @import url directly to your web page then embed the form but not within the JotForm CSS injection. You can also try putting the CSS codes directly to the injecting custom css code feature.