CSS for Listbox depending on item

Hello world,

I tried (unsuccessfully) to use CSS on listbox for each item of it.

What is my goal : Color in green when item is "OK", color in red if item is "KO" ....

I found this Listbox Background Color but it's using CSS for first item, list item or selected item, never depending on label of my item.

Someone have an idea ? Maybe someone already did this

Thank all !