CSS Animations

<!DOCTYPE html>
<html>
<head>
    <style>
        @keyframes denyut {
            0% { transform: scale(1); opacity: 1; }
            50% { transform: scale(1.15); opacity: 0.8; }
            100% { transform: scale(1); opacity: 1; }
        }
        .lingkaran-denyut {
            width: 80px;
            height: 80px;
            background: #e34f26;
            border-radius: 50%;
            margin: 40px auto;
            animation: denyut 1.5s infinite ease-in-out;
        }
    </style>
</head>
<body>
    <div class="lingkaran-denyut"></div>
</body>
</html>