Qlik Sense - Using a Variable Value to get different colors for Negative/Positive numbers

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Hi Qlikers,

I am pretty new to Qlik and I seems to be having a challenge getting different colors for Negative and postie numbers. I have read so many posts on this and I used the same expressions but non of it seems to changed the colors.

I have Variable name  = v_P1-P3 YoY

I want Colors Negative = Green()

I want Colors positive = Red()

I used the expression, what I got from community.

if($(v_P1-P3 YoY)<0,green(),red())

However, the expression is validating is but color is not changing to green as per the formula. What am I doing wrong here? Anyone who can help would be really appreciated. Thanks