.guest{background:url(https://tecnoblog.net/wp-content/themes/tb/img/retina/user.png) no-repeat!important;background-size:30px 30px!important}.topo a{background:url(https://tecnoblog.net/wp-content/themes/tb/img/retina/topo.png) no-repeat center;background-size:50px 50px}