.play-btn_playing {
  width: 200px;
  height: 200px;
  background: radial-gradient( rgba(0, 255, 128, 0.8) 60%, rgba(255, 255, 255, 1) 62%);
  border-radius: 50%;
  position: relative;
  display: block;
  margin-top:50px;
  box-shadow: 0px 0px 50px 3px rgba(0, 255, 128, 0.8);
}

/* triangle */
.play-btn_playing::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  -webkit-transform: translateX(-50%) translateY(-50%);
  transform: translateX(-50%) translateY(-50%);
  transform-origin: center center;
  width: 0;
  height: 0;
  border-top: 30px solid  #fff;
  border-bottom: 30px solid  #fff;
  border-left: 30px solid #fff;
  border-right: 30px solid #fff;
  z-index: 100;
  -webkit-transition: all 200ms linear;
  transition: all 200ms linear;
}

/* pulse wave */
.play-btn_playing:before {
  content: "";
  position: absolute;
  width: 150%;
  height: 150%;
  -webkit-animation-delay: 0s;
  animation-delay: 0s;
  -webkit-animation: pulsate1 .5s;
  animation: pulsate1 .5s;
  -webkit-animation-direction: forwards;
  animation-direction: forwards;
  -webkit-animation-iteration-count: infinite;
  animation-iteration-count: infinite;
  -webkit-animation-timing-function: steps;
  animation-timing-function: steps;
  opacity: 1;
  border-radius: 50%;
  border: 5px solid rgba(255, 255, 255, .75);
  top: -26.9%;
  left: -26.9%;
  background: rgba(198, 16, 0, 0);
}

@-webkit-keyframes pulsate1 {
  0% {
    -webkit-transform: scale(0.6);
    transform: scale(0.6);
    opacity: 1;
    box-shadow: inset 0px 0px 25px 3px rgba(255, 255, 255, 0.75), 0px 0px 25px 10px rgba(255, 255, 255, 0.75);
  }
  100% {
    -webkit-transform: scale(1);
    transform: scale(1);
    opacity: 0;
    box-shadow: none;

  }
}

@keyframes pulsate1 {
  0% {
    -webkit-transform: scale(0.6);
    transform: scale(0.6);
    opacity: 1;
    box-shadow: inset 0px 0px 25px 3px rgba(255, 255, 255, 0.75), 0px 0px 25px 10px rgba(255, 255, 255, 0.75);
  }
  100% {
    -webkit-transform: scale(1, 1);
    transform: scale(1);
    opacity: 0;
    box-shadow: none;

  }
}