start.css

#projectMPlugin {
  position: fixed;
  top: 0;
  bottom: 0;
  right: 0;
  width: 320px;
  z-index: 65000;
  background: transparent;
}

#projectMPlugin .one-stream {
  width: 100%;
  height: 180px;
  margin: 0;
  margin-top: 5px;
  position: relative;
  box-shadow: -2px 0px 20px 2px rgba(74, 74, 74, 0.2);
}

#projectMPlugin .one-stream .stream {
  width: 100%;
  height: 100%;
}

#projectMPlugin .one-stream .mute-icon {
  z-index: 65010;
  position: absolute;
  display: none;
  width: 8.75%;
  height: 8.75%;
  cursor: pointer;
  background: url('./mute.png') center center no-repeat;
  background-size: contain;
}

#projectMPlugin .one-stream:after,
#projectMPlugin .one-stream::after {
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  content: '';
  position: absolute;
}

#projectMPlugin .one-stream:hover:after,
#projectMPlugin .one-stream:hover::after {
  background: rgba(74，74，74，0.7);
}

#projectMPlugin .one-stream:hover .mute-icon {
  right: 45.625%;
  bottom: 50%;
  display: block;
}

#projectMPlugin .one-stream.muted .mute-icon {
  bottom: 10px;
  right: 10px;
  opacity: 0.7;
  display: block;
}

#projectMPlugin .one-stream.muted:hover:after,
#projectMPlugin .one-stream.muted:hover::after {
  background: transparent;
}

#projectMPlugin .one-stream.muted:hover .mute-icon {
  opacity: 1;
}