Change Crosshair Colour Basic UI

I currently have a crosshair set up which simply consists of a UI widget with a circle on it to act as the crosshair.

I want to make it so that when the player clicks, it increases the opacity of the circle to give some visual input to the players click.

I originally went about creating a second UI widget with the same circle except with a lower opacity - however I couldn’t get that working properly.

Is there an easier way to set this up that creating two different UI Widgets and switching between them?