button.sound-toggle .icon-sound--off,
button.sound-toggle.sound-on .icon-sound--on {
  display: none;
}

button.sound-toggle.sound-on .icon-sound--off {
  display: block;
}

button.play-toggle {
  display: block;
  position: absolute;
  width: 100%;
  height: 50%;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
}