.toolbar-icon-global-dl-admin-settings-global-dl:before {
    background-image: url(https://global.sharp/restricted/print/mfpdl/modules/global_dl_module/img/icon.png);
}

.toolbar-icon-global-dl-admin-settings-global-dl:active:before,
.toolbar-icon-global-dl-admin-settings-global-dl.is-active:before {
    background-image: url(https://global.sharp/restricted/print/mfpdl/modules/global_dl_module/img/icon.png);
}