[FEAT] Update tree background color to animate via opacity for performance

[xelaint]

💡 Feature request

Feature Name

Update tree background color to animate via opacity for performance

The Desired Behavior

CSS animations should utilize properties/styles that are in the GPU to reduce implicit compositing and lessen memory. transform and opacity should ideally be the only properties that are animated.

Your Use Case

Prior Work

https://medium.com/outsystems-experts/how-to-achieve-60-fps-animations-with-css3-db7b98610108
https://www.smashingmagazine.com/2016/12/gpu-animation-doing-it-right/

Environment

Daffodil version: X.Y.Z
Angular version: X.Y.Z 

 
For Tooling issues:
- Node version: XX  
- Platform:  

Others: