Other styling

Cards that don't have a <ha-element> can still be styled by using the supplied custom:mod-card card. This is only necessary in very very few instances, and likely to bring more problems than it solves. Most likely your card contains another card, in which case that is the one you should apply the styles to.

type: custom:mod-card
card:
  type: custom:beloved-custom-card
  ...
uix:
  style: |
    ha-card {
      ...
    }