.select2-container--admin-autocomplete .select2-results__option[aria-selected=true].drilldown_ok:not(:hover) {
    background-color: var(--selected-row);
}

.select2-container--admin-autocomplete .select2-results__option[aria-selected=false].drilldown_ok:not(.select2-results__option--highlighted):not(:hover) {
    background-color: var(--body-bg);
}
.select2-container--admin-autocomplete .select2-results__option[aria-selected].drilldown_ko:not(:hover) {
    background-color: #888
}

span.drilldown_ko {
    font-style: italic;
}