editor_ckeditor.bartik.admin.css in Editor 7

/**
 * The .bartik.admin.css file is intended to contain styles that override
 * declarations in the Bartik theme.
 */
.region-content .ckeditor-toolbar-configuration ul {
  margin: 0;
  padding: 0;
}
.page-admin #content .ckeditor-toolbar-configuration img {
  margin: 0;
}