.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;}