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.

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    My lightbox form looks great on desktop devises, however is not becoming responsive on mobile. Can I add a css to my form?

    Asked by ksicuro on October 04, 2015 at 12:03 PM

    In my preferences and my design I already have checked boxes for responsive design.

    Page URL:

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    JotForm Support

    Answered by Chriistian on October 05, 2015 at 12:46 AM



    Yes, you can add a custom CSS code in your form. You can check this guide for more information: How to Inject Custom CSS Codes

    I accessed your site in my mobile device and it seems that the form is displayed properly. See screenshot below.


    Can you give us a screenshot of the issue you are encountering so we can further check? What device are you using when you encounter the issue? 

    We will wait for your response.