.tabs-special .tab-header-0 button::before {
    background-image: url("../images/tabs/Tab_IT-Loesungen.png");
}
.tabs-special .tab-header-1 button::before {
    background-image: url("../images/tabs/Tab_Cloud-Services.png");
}
.tabs-special .tab-header-2 button::before {
    background-image: url("../images/tabs/Tab_Managed-Monitoring.png");
}
.tabs-special .tab-header-3 button::before {
    background-image: url("../images/tabs/Tab_IT-Beschaffung.png");
}