HTML Table with alternative row color, Using SQL XML

Hi,
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
Begin
SET
@HTML =
'<html><style>
tr:nth-of-type(even) {
background-color:#ccc;
</style><body><h1 style="font-family:Tahoma; font-size:12px;">Hi,</h1>'
+
'Below is the report'+
'<br></br>'+
'<table border="1" width="100%" style="border:1px solid #77bfe4;font-family:Tahoma; font-weight:normal; font-size:12px;" cellpadding="4" cellspacing="0">'
+
'<tr bgcolor="yellow" style="font-family:Tahoma; font-weight:bold; font-size:12px;"><td colspan="2"><center>Report</center></td></tr>'+
'<tr bgcolor="Blue" style="font-family:Tahoma; font-weight:bold; font-size:12px;"><td><center>Col1</center></td><td><center>col2</center></td></tr>'
+
CAST((
Select
td =
col1, '',
td
= col2
, '' from
(Select ID as col1, Emp as Col2
from
Employee) E
FOR XML
PATH('tr'),
TYPE
AS NVARCHAR(MAX))
+ '</table><br>Thank you</br></body></html>'
END
select
ISNULL(@HTML,'NoEmail')
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
Please help.
Thank you for your help in advance.

Thank you for the response, I got the code to work.
DECLARE @HTML NVARCHAR(MAX) ;
IF (SELECT COUNT(*) from Employee]) != 0
Begin
SET @HTML = '<h1 style="font-family:Tahoma; font-size:12px;">Hi,</h1>' +
'Below is the report'+
'<br></br>'+
'<table border="1" width="100%" style="border:1px solid #77bfe4;font-family:Tahoma; font-weight:normal; font-size:12px;" cellpadding="4" cellspacing="0">' +
'<tr bgcolor="yellow" style="font-family:Tahoma; font-weight:bold; font-size:12px;"><td colspan="2"><center>Report</center></td></tr>'+
'<tr bgcolor="Blue" style="font-family:Tahoma; font-weight:bold; font-size:12px;"><td><center>Col1</center></td><td><center>col2</center></td></tr>' +
CAST(( SELECT CASE when (ROW_NUMBER() over (Order by Col1 DESC))%2 = 0 then '#E0E0E0' else 'white' END as "@bgcolor", '',
td = col1, '',
td = col2 , '' from
(Select ID as col1, Emp as Col2
from Employee) E
FOR XML PATH('tr'), TYPE
) AS NVARCHAR(MAX)) + '</table><br>Thank you</br></body></html>'
END
select ISNULL(@HTML,'NoEmail')

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478 db_block_buffers                                                                          3 0
482 db_block_checksum                                                                         2 TYPICAL
484 db_block_size                                                                             3 8192
682 db_file_multiblock_read_count                                                             3 128
942 db_block_checking                                                                         2 FALSE
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