#iframe-mobile {
    display: none;
}



@media (min-width: 750px) {
    #nav{
        height: 87px
    }
}

@media (min-width: 850px) {
    #nav{
        height: 100px
    }
}

@media (max-width: 850px) {
    #iframe-mobile {
        width: 100vw;
        height: 80vh;
        display: block;
    }

    #main{
        position: fixed;
    }
}

#main{
    margin-top: 92px;
}

/*@media (max-width: 850px) {*/
/*    #main{*/
/*        margin-top: 82px;*/
/*    }*/
/*}*/