Climate Card Increment Area Font Size Question

[jpoeppelman1]

Does anyone know how to change the font size of the area highlighted below? I'm using the below to customize the size, but can't figure out the highlighted area. Any help greatly appreciated.

            card_mod:
              style: |
                ha-card {
                  --icon-size: 100px;
                  --icon-symbol-size: 80px;
                } 
                :host {
                  --mush-card-secondary-font-size: 25px;
                }