To use the upfront color code #UFC[0...n] in my own widget.

Hello,

I have buit a widget which is using Bootstrap style. I would like to define a style which could use the #UFC[0...n] colors defined in upfront theme settings.
We are developing different widgets whose communicate with our API, and we want to use Upfront to design our page.
We can add our widgets by the widget object available in the Upfront tool.
It is very important for use those codes, all widgets we made, have to match perfectly with upfront.