Banner-card and coloured values

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1

I would like to change the color of a sensor depending on the value. Something like “red if less than 20”

I tried with

type: 'custom:banner-card'
heading: "\U0001F321 Temp"
background: '#808080'
color: black
entities:
  - entity: sensor.home_cucina_temperature
    name: Salotto
    map_state:
      ["<",20]:
        color: red

With no effect. Is something like that possible?

2

Did you ever get anywhere with this - I’d like to do exactly the same?

3

What I am trying to do is to show the entity when temperature is between 20C and 23C, and the color yellow:

Cant figure this out but this hides the entity when temperature is lower than 19C:

 - entity: sensor.aqara_multisensor_temperature 
    name: TEST
    when:
      state:
        - '>'
        - 19

This does not work:

  - entity: sensor.aqara_multisensor_temperature
    map_state:
      - '>'
      - 18
        color: yellow
    when:
      state:
        - '>'
        - 18