Change field color in service portal incident

[Snow Tomcal]

Hi, I have a "priority" field in my incident form, that changes according to other fields. I want to add color, so that when priority is high the field will turn red, and the same with the rest of the priorities.
I think I need to add something to the widget html in order to do that, can anyone help me with that?

[Ryan Maddock]

Please see https://docs.servicenow.com/bundle/washingtondc-platform-administration/page/administer/navigation-a...