How to change the background color of the pivot table with alternate darkgrey and lightgrey including the null values?

[vishakhaw]

Right now I am using

=If(Mod(RowNo(TOTAL), 2) = 0, rgb(243,243,243),rgb(217,217,216))

But the color is not getting applied to the Null() values, the rows having nulls end up with a different stripe.

Any Answers?