how to change background color of the select box on select2 (bootstrap theme)

the javascript ofc

$(document).ready(function() {
          $('.js-example-basic-single').select2({
            theme: "bootstrap-5"
          });
       });

the HTML

<select class="js-example-basic-single bg-dark" style="background-color: #343a40 !         important;" name ="state"></select>

its missing just around the block, heres what it currently looks like. i just cant find the tag name to change the background color