Expander-card, how to change Font size

Configuration Frontend
1

Hi,

New on this forum, so excuse me if my post isn’t clear :slight_smile:

I am using the Expander-card, but the text size of the “header/Title” is too small to my liking. I can’t seem to figure out how to make it bigger. See code below and picture how it looks now, any help is appreciated. Still a bit new to YAML. (I have tried adding font_size 20, but it doesn’t change anything.

type: custom:expander-card
gap: 0.6em
padding: em
clear: false
title: 📊 Rick PC Monitor 📊
Font_size: 20
overlay-margin: 2em
child-padding: 0.5em
button-background: transparent
cards:

- type: vertical-stack
  cards:
  - type: custom:bubble-card
    card_type: separator
    icon: mdi:home-assistant
    name: Rick PC Monitor
  - type: tile
    entity: switch.rickpc_remote_socket_1
    name: Computer Rick
    icon: mdi:desktop-classic
    show_entity_picture: false
    vertical: false
    color: orange
    hide_state: false
    state_content:
      - state
      - last_changed

image