.reveal .slide-header {
    /* position: fixed; */
    /* text-align: center; */
    position: absolute;
    width: 100%;
    top: 0;
    left: 0;
    padding: 0;
    margin: 0;
    background-image:
        url(../../assets/images/logos/logo-zhaw.svg);
    background-repeat: no-repeat;
    background-size: 90px, 90px;
    background-position: 100%;
    z-index: -99;
}