Unable to change card title text size

I have tried a myriad of solutions, but I can’t change the size of the title text of a grid card.
This is the structure of my grid:

square: false
type: grid
cards:
  - type: custom:mushroom-template-card
    primary: Cucina
    secondary: ""
    icon: mdi:food-variant
    badge_icon: ""
  - type: custom:gap-card
  - type: custom:mushroom-light-card
    entity: light.led_kitchen_neopixel_ws2812_led_kitchen
    use_light_color: true
    fill_container: false
  - type: custom:mushroom-light-card
    entity: light.led_kitchen_2_neopixel_ws2812_led_kitchen_2
title: Cucina
columns: 2

You mean that “title: Cucina” part?
Go to the main card-mod thread → 1st post → link at the bottom titled “fantastic” → grid

yes, I meant the section title: Cucina

:+1: