.admin__menu .level-0.item-wtrootmenu > a:before {
/*    content: url('../images/icon.png');
    height: 28px !important;
    margin: 0 auto;
    width: 30px !important;*/
    content: '';
    background-image:url("../images/icon.png");
    background-size: contain;
    background-repeat: no-repeat;
  	background-position: center;
}