Setting cell color for 7.4 grid

I’m trying to convert from 7.3 to 7.4 to leverage the new grid. For the most part the conversion is working, however I’m unable to add colors to my cell. This was done in 7.3 with the table by implementing a CellStyleGenerator along with a custom theme.

fullBook.setCellStyleGenerator(new Table.CellStyleGenerator() {
public String getStyle(Table source, Object itemId, Object propertyId) {
if (propertyId != null) {...
.v-table-cell-content-green { background: #33BB00; }
.v-table-cell-content-orange { background: #FCB724; }

This works fine with the Table, but I can’t seem to get this to work with the Grid.
I’ve changed my stylesheet as follows :

.v-grid-cell-content-green { background: #33BB00; } .v-grid-cell-content-orange { background: #FCB724; } And I’m able to see the Grid.CellStyleGenerator.getStyle method returning the correct value. Still, no colors in the grid.

Any suggestions on how to fix or debug this?