How to change background color of the 2nd column (dimension) in Crosstab?

I am using Design Studio 1.3 to create a Dashboard. I have used Crosstab component inside dashboard.

I am displaying Company, Year Month, Sales, Sales QTY, Profit columns in Crosstab.

I would like change the background color of the Company and Year Month columns in crosstab.

By using the below code, I am able to change the background color of Company (1st column of Crosstab).

.sapzencrosstab-RowHeaderArea

{      font-weight: bold;     

font-family: "Calibri";     

font-size: 11px; 

background-color: #eaeeea;   

}

How to change the background color of the 2nd dimension column i.e Year Month?

Thanks for your help in advance.

Regards,

Hari