iframe {
    width: 100vw !important;
    height: 100vh !important;
    position: absolute;
    border: 0 none;
    /* z-index: -1; */
    position: absolute;
}

span.chicon img {
    max-width: 25px;
}

@media only screen and (max-width: 600px) {
    iframe#ifplayer {
        height: 72vw !important;
    }
}