iframe#Microsoft_Omnichannel_LCWidget_Chat_Iframe_Window {
    width: revert-layer;
}

@media screen and (min-height: 570px) and (max-height: 780px) {
    iframe#Microsoft_Omnichannel_LCWidget_Chat_Iframe_Window {
        height: stretch;
        height: -webkit-fill-available;
        height: -moz-available;
    }
}