.pimcore_icon_analytics {
    background: url(/bundles/pimcoreadmin/img/flat-color-icons/pie_chart.svg) center center no-repeat !important;
}

.pimcore_icon_analytics_explorer {
    background: url(/bundles/pimcoreadmin/img/flat-color-icons/line_chart.svg) center center no-repeat !important;
}