#referenten {
    background:#ededed;
    padding-top: 10px;
    padding-bottom: 10px;
}
.border-dark {
    border-color:#003342 !important;
}
@media screen and (min-width: 992px) {
    #referenten {
        background: none;
    }
    #referenten .speaker {
        background:#ededed;
        padding: 10px;
        border-radius: 20px;
    }
    
}