Change color of label depending on temperature

See this: A more compact way to do "conditional" label/icon/color/whatever in MainUI page - #3 by jimtng

Instead of items.YourItemName.numericState use: #'YourItemName'. This is documented here: Widget Expressions & Variables | openHAB

  background: =#'Heizung_Wohnzimmer_Aktuelle_Temperatur' > 21 ? 'red' : #'Heizung_Wohnzimmer_Aktuelle_Temperatur' > 19 ? 'orange' : 'blue'
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