<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
<div class="row">
<h2>Create your snippet's HTML, CSS and Javascript in the editor tabs</h2>
<button class="pulse-button"></button>
</div>
</div>
.pulse-button {
width: 60px;
height: 60px;
border: none;
box-shadow: 0 0 0 0 rgba(251, 86, 7, 0.5);
cursor: pointer;
-webkit-animation: pulse 1.25s infinite cubic-bezier(0.66, 0, 0, 1);
-moz-animation: pulse 1.25s infinite cubic-bezier(0.66, 0, 0, 1);
-ms-animation: pulse 1.25s infinite cubic-bezier(0.66, 0, 0, 1);
animation: pulse 1.25s infinite cubic-bezier(0.66, 0, 0, 1);
background: transparent url(../img/master/play-btn.png) center center no-repeat;
background-color: #FB5607;
transform: translate(-50%, -50%);
text-align: center;
border-radius: 50%;
position: absolute;
top: 50%;
left: 50%;
}
.pulse-button:hover
{
-webkit-animation: none;-moz-animation: none;-ms-animation: none;animation: none;
}
@-webkit-keyframes pulse {to {box-shadow: 0 0 0 45px rgba(232, 76, 61, 0);}}
@-moz-keyframes pulse {to {box-shadow: 0 0 0 45px rgba(232, 76, 61, 0);}}
@-ms-keyframes pulse {to {box-shadow: 0 0 0 45px rgba(232, 76, 61, 0);}}
@keyframes pulse {to {box-shadow: 0 0 0 45px rgba(232, 76, 61, 0);}}
