.myDataGridClass>tbody>tr>td /* Apply border to all cells */
{
   border:1px solid black;
}

.myDataGridClass>tbody>tr>th /* Apply border to headers */
{
   border:1px solid black;
}

.myDataGridClass>tbody>tr>td:last-child /* Remove right-side border */
{
  border-right-width:0;
 
}

.myDataGridClass>tbody>tr>td:first-child /* Remove left-side border */
{
   border-left-width:0;
}

.myDataGridClass>tbody>tr>th:last-child /* Remove right-side header border */
{
   border-right-width:0;
}

.myDataGridClass>tbody>tr>th:first-child /* Remove left-side header border */
{
   border-left-width:0;
}

.myDataGridClass>tbody>tr:last-child>td /* Remove bottom border */
{
    border-bottom-width:0;
}

.myDataGridClass>tbody>tr>th /* Remove top border */
{
   border-top-width:0;
}