card/merchant/assets/scss/plugins/_keyTable.dataTables.min.scss

table.dataTable tbody th.focus,
table.dataTable tbody td.focus {
    box-shadow: inset 0 0 1px 2px $primary-1;
}
div.dtk-focus-alt table.dataTable tbody th.focus,
div.dtk-focus-alt table.dataTable tbody td.focus {
    box-shadow: inset 0 0 1px 2px #ff8b33;
}