Change background color of the whole horizontal stack?

[stray brook]

Hi,

I can't get a horizontal stack to have a background color, only cards like entities etc. Using this code:

card_mod: style: | ha-card { background-color: rgba(255, 0, 0, 0.5); }

Any ideas on how to do it? I want to have a horizontal stack as a header with a specfific background color

[fleet falcon]

iirc the horizontal/vertical stack cards don't have ha-card, if you want to modify them like that the easiest method is to wrap them in the custom:mod-card (or whatever it's called) that comes with card_mod

[full smelt]

use Stack In Card https://github.com/custom-cards/stack-in-card

[indigo pilot]

just do

type: custom:mod-card
card_mod:
  style: |
    ha-card {
      background: red;
    }
card:
  type: horizontal-stack
  cards:
  
    - type: entity
      entity: sun.sun
    - type: entity
      entity: sun.sun
    - type: entity
      entity: sun.sun