Hive integration with custom dashboard

I have setup Hive integration and got this working well, I’m now working on the dashboard to easily manage this. Below is the code so far and two points I’m struggling with to get working.

  1. How do I increase the size of the temperatures on the right and not just the text on the left?
  2. When pressing any of the buttons how do you change the button colour for 5 seconds while its loading?

type: vertical-stack
cards:
  - type: entities
    entities:
      - entity: sensor.thermostat_1_current_temperature
        name: Living Room Temp
        card_mod:
          style:
            hui-generic-entity-row:
              $: |
                state-badge {
                 display: none;
                }
                .info {
                 margin-left:0 !important;
                 font-size: 20px;
                }
      - entity: sensor.thermostat_temperature
        name: Oliver's Room Temp
        card_mod:
          style:
            hui-generic-entity-row:
              $: |
                state-badge {
                 display: none;
                }
                .info {
                 margin-left:0 !important;
                 font-size: 20px;
                }
      - entity: sensor.thermostat_1_boost
        card_mod:
          style:
            hui-generic-entity-row:
              $: |
                state-badge {
                 display: none;
                }
                .info {
                 margin-left:0 !important;
                 font-size: 20px;
                }
      - entity: sensor.thermostat_1_state
        name: State
        card_mod:
          style:
            hui-generic-entity-row:
              $: |
                state-badge {
                 display: none;
                }
                .info {
                 margin-left:0 !important;
                 font-size: 20px;
                }
  - type: conditional
    conditions: []
    card:
      square: true
      type: grid
      cards:
        - show_name: true
          show_icon: true
          type: button
          entity: sensor.thermostat_1_boost
          name: Boost 30
          icon: mdi:fire
          show_state: false
          tap_action:
            action: call-service
            service: hive.boost_heating_on
            target: {}
            data:
              entity_id: climate.thermostat_1
              time_period: '00:30:00'
              temperature: 20
          hold_action:
            action: none
        - show_name: true
          show_icon: true
          type: button
          tap_action:
            action: call-service
            service: hive.boost_heating_on
            target: {}
            data:
              entity_id: climate.thermostat_1
              time_period: '00:45:00'
              temperature: 20
          entity: sensor.thermostat_1_boost
          name: Boost 45
          icon: mdi:fire
          hold_action:
            action: none
          show_state: false
        - show_name: true
          show_icon: true
          type: button
          tap_action:
            action: call-service
            service: hive.boost_heating_on
            target: {}
            data:
              entity_id: climate.thermostat_1
              time_period: '00:60:00'
              temperature: 20
          entity: sensor.thermostat_1_boost
          name: Boost 60
          icon: mdi:fire
          hold_action:
            action: none
          show_state: false
      columns: 3
  - type: conditional
    conditions:
      - condition: state
        entity: sensor.thermostat_1_boost
        state: 'ON'
    card:
      type: horizontal-stack
      cards:
        - type: entity
          entity: sensor.thermostat_1_boost
          icon: mdi:clock-digital
          attribute: Boost ends in
          name: Boost ends in
          state_color: true
        - show_name: true
          show_icon: true
          type: button
          tap_action:
            action: call-service
            service: hive.boost_heating_off
            target: {}
            data:
              entity_id: climate.thermostat_1
          entity: sensor.thermostat_1_boost
          hold_action:
            action: none
          name: Cancel
          icon: mdi:fire-off