Mushroom-entity-card how to remove icon background

Hi,
I tried many of the card-mods suggested in previous posts, but none seems to work.
I have the latest of everything, in particular Mushroom v5.1.1 and card-mod v4.2.1. Apparently, the old ways don’t work anymore.

Using Chrome Developper’s Tool, I pinpoint the style declaration I need to alter. See the picture:


My guess is

mushroom-shape-icon
  .shape
     background-color

must be set to the value I want.
But how, in YAML in the card-mod/style section, do I declare the style change?

Suggest you migrate from card_mod to UIX. UIX now has DOM helpers, one which is uix_path() which gives boilerplate code to target element selected in Browser inspector. No more guessing.

Thanks, I’ll give it a try.