Pluggable calculator widget

Hi I want to build a calculator widget which will add the values passed to the attribute. and I want to style the widget with different color.   Does anyone know how to achieve that   Thank you  
1 answers

I’m sorry, but this is way too broad of a question to answer.

Have you done at least the ‘Beginner’ and ‘Rapid’ learning paths on the Academy?

The Academy learning paths can be found here: