.cat_menu {
    margin: 3px 0;
    text-align: left;

}
.cat_menu:after {
    /* symbol for "opening" panels */
    font-family: 'Glyphicons Halflings';  /* essential for enabling glyphicon */
    content: "\e080";    /* adjust as needed, taken from bootstrap.css */
    float: right;        /* adjust as needed */
    color: grey;         /* adjust as needed */
    margin-right: 10px;
}
.cat_menu.collapsed:after {
    /* symbol for "collapsed" panels */
    content: "\e114";    /* adjust as needed, taken from bootstrap.css */
}