View file system/web/js/source/jui/css/base/jquery.ui.selectable.css
/*! jQuery UI - v1.9.2 - 2012-11-23 * http://jqueryui.com * Includes: jquery.ui.selectable.css * Copyright 2012 jQuery Foundation and other contributors; Licensed MIT */ .ui-selectable-helper{position:absolute;z-index:100;border:1px dotted black}