Add CSS

app/webpacker/controllers/accessible_autocomplete_controller.js

@@ -1,8 +1,9 @@
 import { Controller } from "@hotwired/stimulus"
 import accessibleAutocomplete from "accessible-autocomplete"
+import 'accessible-autocomplete/dist/accessible-autocomplete.min.css'
 
 export default class extends Controller {
-  initialize() {
+  connect() {
     accessibleAutocomplete.enhanceSelectElement({
       defaultValue: '',
       selectElement: this.element