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.
You can change the "overall" font size and color of the form by clicking each properties in our editor. Form Style tab:
However, if you want to customize each field, you can do so by injecting a custom CSS codes to your form. Here's a guide: Customize your Form using Custom CSS Codes. If you have any difficulties doing this, let us know. Share with us the form URL and tell us what field that needs to be change.