#player-container #play-pause {
position: absolute;
top: 10px;
left: 10px;
height:50px;
width: 50px;
cursor: pointer;
background-image: url(https://i.imgur.com/kegxuaK.png);
background-size: 50px;
}
.play {
  background-image: url(https://i.imgur.com/kegxuaK.png);
}
.pause {
   background-image: url(https://i.imgur.com/b87n87I.png)!important;
}