Change font of different Header Rows

Hi All,

We have a query with different Key Figures on different rows.

In the design studio, all these are identified as

tr : class = "sapzencrosstab-HeaderRow" ;

td: class="sapzencrosstab-HeaderCellDefault sapzencrosstab-HeaderCellAlternating sapzencrosstab-HeaderCellFirstInRow sapzencrosstab-HeaderCellHierarchy "

In this, i want to change the font style of only few rows.

Can anyone help in how can this be achieved??