Input:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Index</title>
<style>
.ball{
height: 150px;
width: 150px;
background: #009578;
border-radius: 50%;
animation: ball 2s infinite;
}
@keyframes ball{
0%{
opacity: 0;
transform: scale(0);
}
50%{
opacity: 1;
transform: scale(1);
}
100%{
opacity: 0;
transform: scale(1);
}
}
</style>
</head>
<body>
<div class="ball"></div>
</body>
</html>