SQL XML :: HTML Table With Alternative Row Color

I want to send out an email and the email body contains a table with data. I am using SQL to create the HTML table and to populate values inside the table. Below is the code I have so far

DECLARE
@HTML NVARCHAR(MAX)
;
IF (SELECT
COUNT(*)
from Employee])
!= 0

[Code] ....

But I am having trouble generating alternative colors for each row (tr:nth-of-type(odd) is not working for me)

Below is what the table should look like ....