Single-Button Media

/* Basic Media Panel Code */

#multimedia, .media_panel {
  background: magenta !important;
  padding: 0;
  margin: 0;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
}
#multimedia h2, .media_panel h2 {display: none;}

#multimedia embed, .media_panel iframe {
  width: 300px;
  height: 200px;
  position: absolute;
  bottom: calc(50% - 20px);
  left: calc(50% - 35px);
  opacity: .001;
}

/* CHOOSE ONLY ONE OPTION */
/* Small Music Visualizer */

#multimedia, .media_panel {
 -webkit-mask: url('https://i.imgur.com/MWTKBXK.gif') center no-repeat;
  mask: url('https://i.imgur.com/MWTKBXK.gif') center no-repeat;
  width: 20px;
  height: 20px !important;
}

/* YT Play + Pause Button */

#multimedia, .media_panel {
 -webkit-mask: url('https://i.imgur.com/gqTTTvw.png') -26px -7px;
  mask: url('https://i.imgur.com/gqTTTvw.png') -26px -7px;
  width: 30px;
  height: 30px !important;
}