How do you color code a calculation group using field value?

I tried this, but it didn't work:

1 Month = 
var previousperiod =
    CALCULATE(
        SELECTEDMEASURE(),
        DATETABLE[Month Offset] = -2,
        REMOVEFILTERS(DATEPERIOD)
    )

var lastperiod =
    CALCULATE(
        SELECTEDMEASURE(),
        DATETABLE[Month Offset] = -1,
        REMOVEFILTERS(DATEPERIOD)
    )


var calc = 
    DIVIDE( lastperiod - previousperiod, previousperiod)

var result = 
    FORMAT(
    calc,
    SWITCH(
        TRUE(),
        calc > 0.05, "<span style='color:green'>" & FORMAT(calc, "0.00%") & "</span>",
        calc < 0.05, "<span style='color:red'>" & FORMAT(calc, "0.00%") & "</span>",
        "<span style='color:yellow'>" & FORMAT(calc, "0.00%") & "</span>"
    )
)

RETURN
    result

The %Change is the Calcualtion Group itself, not a single measure. There are over 20 DAX measures which I need to calculate 1,3,6,12 month % change over each of them using a calculation group, then color code with field value where > 0.05 is green, < 0.05 is red. Please advise. Thank so much.