#bm-chat-button{
  position:fixed;bottom:20px;right:20px;
  width:60px;height:60px;background:#128C7E;
  border-radius:50%;color:#fff;font-size:30px;
  display:flex;align-items:center;justify-content:center;
  z-index:99999;cursor:pointer;
}
#bm-chat-popup{
  position:fixed;bottom:90px;right:20px;
  width:380px;height:520px;background:white;
  border-radius:12px;box-shadow:0 4px 20px rgba(0,0,0,0.3);
  display:none;overflow:hidden;z-index:99998;
}
#bm-chat-popup.open{display:block;}
#bm-chat-close{
  position:absolute;top:5px;right:5px;
  border:none;background:white;font-size:26px;
  cursor:pointer;z-index:999999;
}
#bm-chat-iframe{width:100%;height:100%;border:none;}
@media(max-width:768px){
  #bm-chat-popup{
    width:100%;height:100%;right:0;bottom:0;border-radius:0;
  }
}