This changes the background colour of the cell:
component: oh-cell
config:
on: =Number.parseFloat(items.Power_Watts.state) >= 500
color: "=Number.parseFloat(items.Power_Watts.state) >= 500 ? 'red' : 'green'"
action: url
actionModal: widget:Webpage display widget
actionModalConfig:
title: TV Guide
URL: https://www.yourtv.com.au/guide/nownext/
height: "600"
header: TV Guide
title: TV Guide
icon: f7:tv
actionUrl: https://www.freeview.com.au/tv-guide
slots: null
NOTE: If you have a trend line item in the cell then the colour will not change.