Change background color with CSS

Hi all,

I am desperately trying to change the background color of the header area in my crosstab.

As I want to change the whole header part I am using following css code (according to Customize your layout in SAP BusinessObjects Design Studio)

.sapzencrosstab-ColumnHeaderArea .sapzencrosstab-HeaderCellDefault, 

.sapzencrosstab-ColumnHeaderArea .sapzencrosstab-HeaderCellAlternating, 

.sapzencrosstab-DimensionHeaderArea .sapzencrosstab-HeaderCellAlternating, 

.sapzencrosstab-DimensionHeaderArea .sapzencrosstab-HeaderCellDefault{ 

     color: white; 

     background-image: none!important; 

     background-color: #A7C942!important; 

    }

It seems to work for the font color but the background color stays exactly as it is :-(

Any idea what is wrong here?

Thanks!

Mehtap