console
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<style type="text/css">
.root{
width: 300px;
height: 300px;
position: relative;
margin: 100px auto;
background-color: red;
overflow: hidden;
}
.root div{
width: 600px;
height: 600px;
border-radius: 46%;
background-color: lightblue;
position: absolute;
left: -150px;
bottom: 40px;
animation: test 5s linear infinite;
}
@keyframes test{
from{
transform: rotate(0deg);
}
to{
transform: rotate(360deg);
}
}
</style>
</head>
<body>
<div class="root">
<div></div>
</div>
</body>
</html>