Change text color of a mushroom title card

My wall mounted dashboard is setup using LCars Modern with mushroom cards. The mushroom title cards are a shade of yellow and the text is white – very hard to read unless I get up very close and look.

I’ve been trying to change the text color to give some contrast. But it just stays white.

This is my current YAML:

type: custom:mushroom-title-card
title: Living Room
card_mod:
  class: header-left
  style: |
    ha-card {
      color: blue;
    }

Following is the link I’ve been referring to in my attempts.

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