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.
Are you referring to the text labels? The font color is white which is why they are not clearly visible when the required field is not filled up. You can change the background color of the required field error, we can make it dark so that the white text will be visible.
You can achieve that by applying this CSS code on your form.
background-color: #666666 !important;
Here's a guide on how to inject custom CSS. Hope this helps. Thank you.