DataTables's CSS is highly customized in sass/vendors/plugins/_datatables.scss SCSS file in order to use it as a native component within the design system.
The SCSS code is compiled into assets/plugins/global/plugins.bundle.css and globally included in all pages.
DataTable's global settings are configured in src/js/vendors/plugins/datatables.init.js and this initialization code is bundled within
assets/plugins/custom/datatables/datatables.bundle.js.