<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
*{
margin: 0;
padding: 0;
}
body{
background-color: purple;
}
.box{
width: 400px;
height: 400px;
background: linear-gradient(to top, black 50%, white 50%);
margin: 100px auto;
border-radius: 50%;
font-size: 0;
animation: animate 2s infinite linear;
}
.box div{
display: inline-block;
width: 200px;
height: 200px;
border-radius: 50%;
margin-top: 100px;
}
.left{
background: radial-gradient(white 20%, black 20%);
}
.right{
background: radial-gradient(black 20%, white 20%);
}
@keyframes animate {
0%{
transform: rotate(0deg);
}
50%{
transform: rotate(180deg);
}
100%{
transform: rotate(360deg);
}
}
</style>
</head>
<body>
<div class="box">
<div class="left"></div>
<div class="right"></div>
</div>
</body>
</html>
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