How to hide the Alarmo Card header completely?

Configuration Frontend
1

I’ve been trying to use cardmod to hide the Alarmo card header with little success.

Can someone point me what I’m missing?

    type: custom:alarmo-card
    entity: alarm_control_panel.alarm
    name: " "
    keep_keypad_visible: true
    use_clear_icon: true
    states:
      armed_vacation:
        hide: true
    show_messages: true
    show_ready_indicator: true
    show_bypassed_sensors: true
    card_mod:
      style: |
        ha-card > div.header {
          display: none !important;
        }

I believe the problem is the selector, but I can’t figure out what’s wrong.
I’ve been reading lots of card-mod posts, and tried so many combinations I’ve lost count.

FTR, this is the full component tree:

image
image1285×728 47 KB

Thanks a lot.