#audio-control {
  right: 1rem;
  width: 2rem;
  bottom: 1rem;
  height: 2rem;
  color: #fff;
  display: block;
  margin: 0 auto;
  cursor: pointer;
  position: absolute;
  border: medium none;
  padding: 0.5rem 1rem;
  background-repeat: no-repeat;
}

.bg-overlay {
  left: 0;
  bottom: 0;
  width: 100%;
  z-index: 11;
  height: 100%;
  display: block;
  position: absolute;
  background-color: rgba(0, 0, 0, 0.65);
}