Database Conditional Background Colour

Hi!

Quick one again from me! (sorry all!) I’m working on my finance database here and I’d like to make it so if the number value is positive e.g. £10.50 then the background of the input box will be green on the RG, however if the value is negative like -12.35, then the background of the input box will be red on the RG, I’ve tried to achieve this below but am getting no where, can anyone advise me?

Resolved this myself by using my brain! (Doh!) For those wondering, using the equal to or less than value gets the result required, see my below

part2