Changing font size in my Gauge Card?

Hi,
I have (by trial and error) a config-template-card modified gauge card:

type: custom:config-template-card
entities:
  - sensor.givtcp_sa2219g385_soc
  - sensor.my_battery_soc_increasing
card:
  type: gauge
  entity: sensor.givtcp_sa2219g385_soc
  name: >-
    ${"Battery SoC:\u3000("+ states["sensor.my_battery_soc_increasing"].state
    +")"}
  needle: true
  severity:
    green: 66
    yellow: 33
    red: 0

I would like to make the gauge name: bigger/bolder? Can you suggest a way?

Regards, Martin