<!DOCTYPE html>
<head>
<title></title>
<style>
.animate-1 {
width: 40px;
height: 40px;
background-color: red;
margin: 100px auto;
? ? animation: swing1 1s ease-in-out infinite;
? ? transform: rotate(-5deg);
? ? transform-origin: top center;
}
@keyframes swing1 {
? ? 0% { transform: rotate(-5deg); }
? ? 50% { transform: rotate(5deg);}
? ? 100% { transform: rotate(-5deg);}
}
</style>
</head>
<body>
</div>
</body>
</html>
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