.main-header {
    padding: 0;
    background-image: url(homebg.jpg);
    background-position: top 90px  right 0px;
    background-position: center center;
    background-repeat: no-repeat, no-repeat, no-repeat;
    background-size: cover;
    color: white;
    height: 600px;
}



@media (max-width: 639px) {
    .slideright {
        text-align: center;
        margin-left: auto;
        margin-right: auto;
    }

    .main-header {
        padding: 0;
        height: 550px;
        background-image: url(01-xsml.jpg);
        background-position: top 90px right 0px;
    }
}




@media (max-width: 768px) {


    .main-header {
        padding: 0;
        height: 600px;
        background-image: url(homebg.jpg);
        //background-position: top left, left, right;
        background-position: top 90px right 0px;
    }
}