app/public/plugins/datatables-keytable/css/keyTable.bootstrap4.css

table.dataTable tbody th.focus,
table.dataTable tbody td.focus {
  box-shadow: inset 0 0 1px 2px #0275d8;
}

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;
}