
Explanation
Text Description automatically generated

Box 1: On the RiskLevel button.
On the RiskLevel button fill property.
Box 2: Risklevel.Fill = RiskStatus.Value > 75 ? Red : Green;
Most every type of control in a Power App, has a Fill property, for the fill color.
Reference:
https://wonderlaura.com/2020/07/23/power-apps-gallery-conditional-formatting/