.rm-video-player__comment-button {
  opacity:0;
  left: 93%;
  top: 80%;
}
.rm-video-player__comment-button::after{
  content: " 💬 ";
  font-size: 14 !important;
  color: transparent !important;
    text-shadow: 0 0 0 black;
  padding:5px;
  border-radius:10px;
  background-color:white;
  opacity:.5;
  top: 95%;
  cursor: cell;
}
.rm-video-player__container:hover .rm-video-player__comment-button {
  opacity:.5;
}