<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="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
<div class="row"><div class="box">
<div class="circle-effect">
<h4>Hello</h4>
</div>
</div>
</div>
</div>
body {
background-color: #000;
}
.circle-effect{
position: absolute;
left: 10%;
top: 15%;
width: 100px;
height: 100px;
background: #ff2a22;
border: 2px solid rgba(221, 221, 221, 0.8);
border-radius: 50%;
text-align: center;
vertical-align: middle;
color: #fff;
-webkit-animation: ripple-white 1s linear infinite;
animation: ripple-white 1s linear infinite;
-webkit-transition: .5s linear;
text-shadow: 1px 1px 1px #000;
display: flex;
align-items: center;
justify-content: center;
z-index: 4;
}
@-webkit-keyframes ripple-white {
0% {
-webkit-box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.1), 0 0 0 20px rgba(255, 255, 255, 0.1), 0 0 0 40px rgba(255, 255, 255, 0.1);
box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.1), 0 0 0 20px rgba(255, 255, 255, 0.1), 0 0 0 40px rgba(255, 255, 255, 0.1)
}
100% {
-webkit-box-shadow: 0 0 0 20px rgba(255, 255, 255, 0.1), 0 0 0 40px rgba(255, 255, 255, 0.1), 0 0 0 60px rgba(255, 255, 255, 0);
box-shadow: 0 0 0 20px rgba(255, 255, 255, 0.1), 0 0 0 40px rgba(255, 255, 255, 0.1), 0 0 0 60px rgba(255, 255, 255, 0)
}
}
@keyframes ripple-white {
0% {
-webkit-box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.1), 0 0 0 20px rgba(255, 255, 255, 0.1), 0 0 0 40px rgba(255, 255, 255, 0.1);
box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.1), 0 0 0 20px rgba(255, 255, 255, 0.1), 0 0 0 40px rgba(255, 255, 255, 0.1)
}
100% {
-webkit-box-shadow: 0 0 0 20px rgba(255, 255, 255, 0.1), 0 0 0 40px rgba(255, 255, 255, 0.1), 0 0 0 60px rgba(255, 255, 255, 0);
box-shadow: 0 0 0 20px rgba(255, 255, 255, 0.1), 0 0 0 40px rgba(255, 255, 255, 0.1), 0 0 0 60px rgba(255, 255, 255, 0)
}
}
