drupal/core/modules/user/css/user.icons.css

/**
 * @file
 * Styling for the user module icons.
 */

/**
 * Toolbar tab icon.
 */
.toolbar-bar .toolbar-icon-user:before {
  background-image: url(../../../misc/icons/bebebe/person.svg);
}
.toolbar-bar .toolbar-icon-user:active:before,
.toolbar-bar .toolbar-icon-user.active:before {
  background-image: url(../../../misc/icons/ffffff/person.svg);
}