.topbar-wrapper a:before {
    display: block;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    content: url('https://kbdirect.ch/img/kbdm-logo.svg') !important;
    max-width: 100%;
    max-height: 100%;
}

.topbar {
    background-color: white !important;
    border-bottom: 2px solid black;
}

    .topbar label {
        color: black !important;
    }