#mute, 
.videomute
{
  cursor: pointer;
  height: 40px;
  width: 40px;
  position: absolute;
  top: 10px;
  right: 15px;
  background-size: cover;
  opacity: 0.5;
  z-index:2;
}

#mute:hover, 
.videomute:hover
{
  opacity: 1;
}