.btn {
  width: 27px;
  height: 27px;
  background-color: #fff;
  border-radius: 50%;
  //position: relative;
  cursor: pointer;
  border: solid 2px #000;
}
.btn::after {
  content: '';
  width: 8px;
  height: 10px;
  border-width: 0 2px 0 2px;
  border-color: transparent #000 transparent #000;
  border-style: solid;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
}
.btn.playback::after {
  width: 0;
  height: 0;
  border-width: 5px 0 5px 10px;
  border-color: transparent transparent transparent #000;
}
.play_button_wrap{
    text-align: center;
}