.pimcore_nav_icon_php {
    background: url(/bundles/pimcoreadmin/img/flat-white-icons/php.svg) center center no-repeat !important;
}

.pimcore_nav_icon_systemrequirements {
    background: url(/bundles/pimcoreadmin/img/flat-white-icons/factory.svg) center center no-repeat !important;
}

.pimcore_icon_database_manager {
    background: url(/bundles/pimcoreadmin/img/flat-white-icons/mysql.svg) center center no-repeat !important;
}