play-btn.html

<div class="play-btn">
  <i class="icon-play-icon"></i>
</div>

<style>

  .icon-play-icon{
    position: relative !important;
    font-size: 22px;
    left:3px;
    top:3px;
  }

  .play-btn{
    width: 100px;
    height: 100px;
    background-color: #4d4d4d !important;
    border-radius: 60px;
    display: block;
    display: flex;
     justify-content: center;
     align-items: center;
    margin-left:auto;
    margin-right:auto;
    position: relative;
  }

  .pulse-ring {
    width: 200px;
    height: 200px;
    border-radius: 100px;
    border: 4px solid #4d4d4d;
    position: absolute;
    top: -50px;
    left: -50px;
    opacity: 0;
    animation: pulsate 2s ease-out;
    animation-iteration-count: infinite;
  }

  @keyframes pulsate {
    0% { transform: scale(0); opacity: 1; }
    100% { transform: scale(1); opacity: 0; }
  }

  .play-btn:before {
    content: "";
    display: block;
    width: 100%;
    height: 100%;
    border-radius: 60px;
    border: 4px solid #4d4d4d;
    position: absolute;
    top: 0;
    left: 0;
    animation: pulsate 2s ease-out;
    animation-iteration-count: infinite;
  }

  .play-btn:after {
    content: "";
    display: block;
    width: 200px;
    height: 200px;
    border-radius: 100px;
    border: 4px solid #4d4d4d;
    position: absolute;
    top: -50px;
    left: -50px;
    animation: pulsate 2s ease-out;
    animation-iteration-count: infinite;
    animation-delay: 0.5s;
  }

</style>