#fe-chat-button {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 9999;
  background: #193c5a;
  color: white;
  border: 0;
  border-radius: 30px;
  padding: 15px 20px;
  font: 600 15px Arial, sans-serif;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(0,0,0,.25);
}
#fe-chat-panel {
  display: none;
  position: fixed;
  right: 20px;
  bottom: 85px;
  width: 380px;
  height: 540px;
  max-width: calc(100vw - 30px);
  max-height: calc(100dvh - 110px);
  z-index: 9999;
  background: white;
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0 5px 30px rgba(0,0,0,.3);
}
#fe-chat-panel iframe {
  width: 100%;
  height: 100%;
  border: 0;
}