/* style the AD button in the player */
.mejs__controls .mejs__ad-button button {
  background: url(audio_description/ad.png) left top  no-repeat;
}
.mejs__controls .mejs__ad-button.mejs__ad-on button {
  background-position-x: -16px;
}
/* the mediaelement audio player needs hidden */
.mejs__container .mejs__mediaelement .mejs__audio {
  display: none;
}