#ct {
      width: 100%;
      height: 100%;
      position: fixed;
      left: 0px;
      top: 0px;
      z-index: 2;
    }

    #cb {
      position: fixed;
      right: 0;
      bottom: 0;
      z-index: 3;
    }
    #cbiframe {
        width: 100% !important;
        height: 100% !important;
    }

    #cb,
    #cb.chatbot_iframe_close {
      width: 300px;
      height: 110px;
    }

    #cb.chatbot_iframe_open {
      width: 571px;
      height: 520px;
    }

    @media screen and (max-width: 850px) {
      #cb.chatbot_iframe_open {
        width: 100%;
        height: 100%;
      }
    }