How can I use attribute state for styling

[victoroos]

hi all,

I think I'm quite ok in Home assistant nowadatys, so I wanted to upgrade my simple dashboard with some bubbles.
Works nicely, time for some styling.

I have this as a button:

` - type: custom:bubble-card
card_type: button
button_type: state
entity: sensor.afvalwijzer_gft
scrolling_effect: false
name: Gft Afval
show_state: true
styles: |2-
.bubble-button-background {
background-color: $hass.states['sensor.afvalwijzer_gft'].attributes.is_collection_date_tomorrow === 'true' ? 'green' :
hass.states['sensor.afvalwijzer_gft'].attributes.is_collection_date_today === 'true' ? 'green' :
hass.states['sensor.afvalwijzer_gft'].attributes.is_collection_date_day_after_tomorrow === 'true' ? 'green' : 'grey'} !important;
}

but I couldn't get it to work. It stays green or grey.
I based it on this discussion:
#512

Any tips?
Cheers