How to change custom button card color based on status of a group

Configuration
,
1

Hi all, I currently am trying to understand yaml…
Hope one of you could help me with the topic below.

I created a group with my cover blinds : “group_status_alle_somfy_rolluiken”.
This group is set to “closed” if all the blinds are closed and this is working fine.

Now I want to use this information to have the color of a custom button card changed : green if all the covers are closed and red if not.

This is the yaml code behind the custom button card but the “color” part is not working. Any feedback appreciated.

      - type: custom:button-card
        tap_action:
          action: call-service
          service: cover.close_cover
          service_data: {}
          target:
            device_id:
              - b0d31b5826836dc6eb185dfe41bf07fb
              - ff9380f9744ec162553b9fa98d749aad
        name: Sluit alle rolluiken
        icon: mdi:window-shutter
        hold_action:
          action: none
        show_state: true
        color: |
          [[[
            if (states['group.group_status_alle_somfy_rolluiken'].state == 'closed') return "green";
            else return 'red';
          ]]]
2

Topic has been resolved.

type: custom:button-card
name: Sluit alle rolluiken
icon: mdi:window-shutter
hold_action:
  action: none
show_state: true
styles:
  icon:
    - color: |
        [[[
           if (states["group.group_status_alle_somfy_rolluiken"].state != 'closed') return 'red'
           else return 'green'
        ]]]
tap_action:
  action: call-service
  service: cover.close_cover
  service_data: {}
  target:
    device_id:
      - b0d31b5826836dc6eb185dfe41bf07fb
      - ff9380f9744ec162553b9fa98d749aad