HA - YAML - Custom:button-card example - conditional checkboxes

type: horizontal-stack
cards:
  - type: custom:button-card
    entity: input_boolean.checkbox1
    name: Checkbox 1
    state_color: false
    state:
      - operator: '=='
        value: 'off'
        icon: mdi:checkbox-blank-outline
        color: var(--paper-item-icon-color)
      - operator: '=='
        value: 'on'
        icon: mdi:checkbox-outline
        color: var(--paper-item-icon-color)
    styles:
      name:
        - font-size: 12px
  - type: custom:button-card
    entity: input_boolean.checkbox2
    name: Checkbox 2
    state_color: false
    state:
      - operator: '=='
        value: 'off'
        icon: mdi:checkbox-blank-outline
        color: var(--paper-item-icon-color)
      - operator: '=='
        value: 'on'
        icon: mdi:checkbox-outline
        color: var(--paper-item-icon-color)
    styles:
      name:
        - font-size: 12px
      card:
        - background-color: >-
            [[[ if (states['input_boolean.checkbox1'].state == 'off')
            {return 'grey';} ]]]
    tap_action:
      action: >-
        [[[ if (states['input_boolean.checkbox1'].state == 'on') {return
        'toggle';} else {return 'null';}]]]