Feature Request: Widget Background Colors

It would be great to be able to define background colors for widgets with a function or state map. For example, if a door sensor is on or open have a red background, as opposed to a green background if it is off or closed

Likewise, being able to simply set background colors for different entities would be useful, for example, color coding light widgets based on room or type

[resoai]

You can access the state of a different entity like so:

state: function () {
    return this.states['sensor.other_entity'].state;
 }

You could create separate css class for each of those states. I’m sure we can work something with the background in future but we do need a better approach than simply changing the background.

[resoai]

OK! here is the link to TG: https://t.me/joinchat/CFM1kQ1ZSNL0T9RB9VwK5w

I will probably include it in README