First of all, I think this card fits your use case really well, however…:
Something like this should work:
type: custom:mushroom-entity-card
entity: sensor.current_time
icon_type: none
primary_info: none
card_mod:
style:
mushroom-state-info$: >
.container {
align-items: center;
}
.secondary {
--card-secondary-font-size: 22px; /* Sets secondary text size */
padding: 15px 0; /* Required so the text isn't cut off above and below */
}
.: >
:host {
--mush-card-primary-font-size: 22px;
--mush-card-secondary-font-size: 100px;
--mush-card-primary-font-weight: lighter;
--mush-card-secondary-font-weight: bolder;
height: 200px
--mush-icon-size: 2px
}
Go here for extensive tutorial on mushroom card styling, most of the :host stuff here is unnecessary: