.icon-usb-dongle:before{content:"";background-image:url("../img/icon_USB_dongle.png");display:block;width:20px;height:20px}.icon-bluetooth:before{content:"";background-image:url("../img/icon_Bluetooth.png");display:block;width:20px;height:20px}.icon-fingerprint-reader:before{content:"";background-image:url("../img/icon_Fingerprint_reader.png");display:block;width:20px;height:20px}