body{
    background-image: url(http://su.tkh.edu.eg/wp-content/uploads/2021/09/thumbnail_Image2.jpg) !important;
    background-repeat: no-repeat !important;
    background-attachment: fixed !important;
    background-size: cover !important;
    background-position: center center !important;
}

@media only screen and (max-width: 600px) {
    body{
     background-image: url(http://su.tkh.edu.eg/wp-content/uploads/2021/09/thumbnail_Image-vertical.jpg) !important;
    }
}

#site-navigation{
    background-color:transparent !important;
}

 .main-navigation #menu > li{
    background-color:transparent !important;
}