iframe[src^="https://webchat.vpsconsulting.ru/"] {
    z-index: 9999;
    /*inset: auto auto 0px -270px !important;*/
    /*bottom: -100% !important;*/

    /*transform: translateY(1000px);*/
    /*transform: translateY(100svh);*/
    display: none;
}
iframe.opened[src^="https://webchat.vpsconsulting.ru/"] {
    /*inset: auto auto 0px calc(100% - 270px) !important;*/
    /*bottom: 0 !important;*/
    /*left: calc(100% - 270px) !important;*/
    
    /*transform: translateY(0);*/
    display: block;
}