#umbraco-logo-mark {
    background-image: url('/App_Plugins/Image/iKIS_transparent.png'); 
    background-size: contain;
    background-repeat: no-repeat;
    width: 60px;
    height: 60px;
    margin-top: 25px; 
    display: block; 
}
    #umbraco-logo-mark svg {
        display: none !important;
    }