Autocomplete selected color:

set select2 selected color based on css_header_background_color

admin_interface/templates/admin_interface/css/admin-interface.css

@@ -3,6 +3,10 @@
     color: {{ theme.css_header_text_color }};
 }
 
+.select2-container--admin-autocomplete .select2-results__option--highlighted[aria-selected] {
+	background-color: {{ theme.css_header_background_color }};
+}
+
 .admin-interface .environment-label {
 }