Hover GeoJSON with multiples polygons with diferents color

Hi, to everyone.
I’m new in Cesium

I would like to ask for help.
I’m working with a GeoJSON that has multiples polygons.
I would like to give a diferent color to each polygon, a color that I will decide, not a random color. For that, I’ve found this example:

It works really well, but now I would like to change the colors of the polygon when the mouse hovers it.
I follow this example, and works well.


Now, I would like to both things, but I’m not able to do it.
Can someone help me?


If you’re still having issues, can you post a Sandcastle of your full code that you’ve tried?