datatable + rcolumn + Style

[krasig]

I have dataTable and css where:

.rich-table{
border: 0;

}
.rich-table-cell{
text-align: left;
color: red;
border: 0;
font: 700;
}
.rich-table-cell_withborder{
text-align: left;
color: red;
border: 2;
font: 700;
}

In table i have 3 columns and in column2 there is:

styleClass="rich-table-cell_withborder"

and I expect that this column will be with border, but this isn't happen.
Where i'm wrong???