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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.box{
width: 500px;
height: 500px;
margin: 40px auto;
background-color: #2b92d4;
border-radius: 50%;
box-shadow: 0 1px 2px rgba(0, 0,0, .3);
animation: breathe 1s ease-in-out infinite alternate;
}
@keyframes breathe{
0%{
opacity: 0.2;
box-shadow: 0 1px 2px rgba(255, 255, 255, 0.1);
}
50%{
opacity: 0.5;
box-shadow: 0 1px 2px rgba(18, 190, 84, 0.76);
}
100%{
opacity: 1;
box-shadow: 0 1px 30px rgba(59, 255, 255, 1);
}
}
</style>
</head>
<body>
<div class="box"></div>
</body>
</html>