.vocalisation-icone {
  width: 32px;
  height: 32px;
  display: block;
  background-image: url('../images/doc-sound-normal.png');
  background-repeat: no-repeat;
}
.vocalisation-icone:hover {
  background-image: url('../images/doc-sound-survol.png');
}
#readspeaker_button1 {
  display: none;
}