iframe#opendialog-chatwindow {
  position: fixed;
  bottom: 20px;
  right: 20px;
  border: none;
  max-height: 750px;
  height: 85%;
  max-width: 400px;
  background-color: #fff;
  box-sizing: border-box;
  transition: all 0.35s ease-in-out;
  width: calc(100% - 40px);
}

iframe.od-opened#opendialog-chatwindow {
  filter: drop-shadow(0 2px 22px rgba(0, 0, 0, 0.15));
}