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.
It currently is not possible to customize the Short Scrollable Terms Widget because it doesn't have the customization option property.
An alternative option you can do is to use instead the TEXT field (Form Tools) and create your the scrollable terms.
Here is the user guide on how to -Creating-a-Scrollable-Terms-and-Conditions
Using the old manual method will give you the flexibility to manually format the TEXT terms.
Here is a demo jotform http://form.jotformpro.com/form/40357772071959 that have it.
Let us know if you need further assistance.