list.admin.css

/* cspell:ignore bulletedlist numberedlist */
.ckeditor5-toolbar-button-bulletedList {
  background-image: url(../icons/bulletedlist.svg);
}

.ckeditor5-toolbar-button-numberedList {
  background-image: url(../icons/numberedlist.svg);
}

File

core/modules/ckeditor5/css/list.admin.css

View source 
  1. /* cspell:ignore bulletedlist numberedlist */

  2. .ckeditor5-toolbar-button-bulletedList {

  3.   background-image: url(../icons/bulletedlist.svg);

  4. }

  5. 

  6. .ckeditor5-toolbar-button-numberedList {

  7.   background-image: url(../icons/numberedlist.svg);

  8. }