Show MoM +/- using color in a Matrix

CAVCX , With help from Date table and time intelligence create meausres like

MTD Sales = CALCULATE(SUM(Sales[Sales Amount]),DATESMTD('Date'[Date]))
last MTD Sales = CALCULATE(SUM(Sales[Sales Amount]),DATESMTD(dateadd('Date'[Date],-1,MONTH)))

diff = [MTD Sales]-[last MTD Sales]
diff % = divide([MTD Sales]-[last MTD Sales],[last MTD Sales])

then create a color Meausre and use that in conditional formatting using field value 

Color = Switch( true() ,

not(isblank(Last MTD sales])) && diff % >= 0, "Green",

not(isblank(Last MTD sales])) && diff % < 0, "Red",

"White")

How to do conditional formatting by measure and apply it on pie?: https://youtu.be/RqBb5eBf_I4

Power BI — Month on Month with or Without Time Intelligence
https://medium.com/@amitchandak.1978/power-bi-mtd-questions-time-intelligence-3-5-64b0b4a4090e
https://www.youtube.com/watch?v=6LUBbvcxtKA