Can I change the way that the form formats any "REQUIRED" answers that aren't filled in?

Hello,

I have a pretty dark design theme to my form so I have all of the text set to be bright yellow to contrast with the dark background. When I require a question, they user must answer the question to continue. When a required question is selected and then unselected without an answer input, the form automatically formats the background of the question to be white, making the yellow text illegible. Is there any way to change this color to dark red or make it do something else like a highlight or an outline?

You can get this changed from the "Advanced Designer" tab in the Form Designer.

You can follow the steps explained in the below thread:

https://www.jotform.com/answers/803299

Thank you! Unfortunately, the advance designer reformatted my form in a way that I did not want. In trying to revert to an earlier backup, I’ve received numerous error messages. What do you make of this?
Thanks,
David Schultz
Tour Manager | Jimmie Allen
Dschultz099@gmail.com
(858) 692-1121
NOTE: This email is for the sole use of the intended recipient(s) only and may contain information that is confidential and/or privileged. If you have received this email in error, please notify the sender immediately and then delete it. If you are not the intended recipient, you must not keep, use, disclose, copy or distribute this email without the author's prior permission. If you are the intended recipient and you do not wish to receive similar electronic messages from us in the future then please respond to the sender to this effect.
...

You may revert to a previous version following this guide: https://www.jotform.com/help/294-How-to-View-Form-Revision-History 

You may also manage the highlight error color, this guide will help you doing so: https://www.jotform.com/help/445-Managing-Field-Error-States-and-Highlight-Effect