Design Studio 1.5 CSS changing column colors in Crosstab

I referenced this below closed thread.

https://scn.sap.com/message/15612191#15612191

I have a similar issue like in the thread, wherein i need to apply formatting to a crosstab with BEx query as datasource having several alert levels.

I need to apply formatting to alternating columns in the crosstab, the columns have same alert levels but need different formatting.

I need to know how i can apply one background formatting to first column and another type formatting to second column both having the same alert levels.

Both the columns are repeating as the hierarchy is expanded so cannot use column position option

ie .sapzencrosstab-DataArea td:nth-child()

Thanks,

Ananti