DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Documenttitle>
<style>
.box{
margin: 100px auto;
width: 200px;height: 200px;
background: transparent;
border: 5px solid black;
border-radius: 50%;
position: relative;
animation: round 3s infinite linear;
}
.box::before{
position: absolute;
top:0px;left:28px;
width: 30px;height: 30px;background: yellow;
border-radius: 50%;
content: "";
}
@keyframes round {
0%{rotate: 0deg;}
100%{rotate: 360deg;}
}
style>
head>
<body>
<div class="box">div>
body>
html>
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