In your css for the datatable you have this class
.dataTable-table > tbody > tr > td,
.dataTable-table > tbody > tr > th,
.dataTable-table > tfoot > tr > td,
.dataTable-table > tfoot > tr > th,
.dataTable-table > thead > tr > td,
.dataTable-table > thead > tr > th {
vertical-align: top;
padding: 8px 10px;
}
change that to this
.dataTable-table > tbody > tr > td,
.dataTable-table > tbody > tr > th,
.dataTable-table > tfoot > tr > td,
.dataTable-table > tfoot > tr > th,
.dataTable-table > thead > tr > td,
.dataTable-table > thead > tr > th {
vertical-align: middle;
padding: 8px 10px;
}
then there is no need to add another class to override it