写一个html 输出一个圆
<!DOCTYPE html>
<html>
<head>
<title>Output a Circle</title>
<style>
.circle {
width: 100px;
height: 100px;
border-radius: 50%;
background-color: red;
}
</style>
</head>
<body>
<div class="circle"></div>
</body>
</html>
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