Is it possible to change the navigation button colors on the feature information widget? I am able to change the text color in the middle of the left right buttons, but the arrows remain purple. We do not have a developer's licence, so customizing the button is not possible. The purple button clashes with the theme of my application. I find it hard to believe ESRI would select such a strange color and force us to use it. #
It sounds like you're using the Violet theme. By default that is the primary color for that theme. Those arrows are controlled by it. If you change the primary, it will change the color for you as well as other areas it is used.