change color dashboard custom sensor

[funky]

Hello there

I have a custom sensor and I want to change the color based on a value.
> 100 red
> 50 yellow
< 50 green

How can I achieve this? I saw dashtics has several options, but I don't want to install dashtics and want to try this within domoticz, because I saw other sensors are doing the same.

Hope someone can help me out.

thnx in advance