Thing press visual response

I have some ‘thing-variable’ icons that I use to activate Hubitat momentary switches (well, switches with the auto-off preference enabled). There are icons displayed according to the state. Generally, they are the same icon in different colors. What I’m going for is for the switch to be green when at rest. Then briefly turn white after being pressed as positive feedback. This works pretty well as expected.

The trouble is that upon pressing the switch, I get a ‘wash’ of translucent white across the tile as it updates, which really detracts from the effects. It’s especially pronounced as I’m using an icon on a transparent background, and the white-wash is noticeably the square shape of the otherwise-invisible tile behind.

Additionally, I get the ‘Command Sent’ response in a box off to the right of the dashboard. It, too, is distracting.

My questions:

  1. What causes the white-wash effect and what can I do to avoid it?
  2. Is there a way to stop the ‘Command Sent’ from showing up?

Here’s a link to a short (and not particularly cinematic) video of the white-wash action:

White-wash effect