If anyone needs to modify the Mushroom Title card, it can be done with card_mod like this:
type: custom:mod-card
card:
type: custom:mushroom-title-card
title: I'd rather be picking
subtitle: Mushrooms 🍄
card_mod:
style:
mushroom-title-card$: |
.title {
--primary-text-color: rgb(var(--rgb-grey));
--title-font-size: 20px;
--title-font-weight: lighter;
}
.subtitle {
--secondary-text-color: rgb(var(--rgb-red));
--subtitle-font-size: 32px;
--subtitle-font-weight: bolder;
}
.header {
--title-padding: 8px 24px 8px;
}