正方形与圆边框
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>正方形与圆边框的css</title>
<style>
.d{
width: 150px;
height: 150px;
border:1px solid #00F;
}
.s{
width: 150px;
height: 150px;
border:1px solid #00F;
border-radius: 50%;
}
.p{
width: 100px;
height: 100px;
border:1px dashed #000;
border-radius: 50%;
}
</style>
</head>
<body>
<div class="d">
<div class="s">
<div class="p">
</div>
</div>
</div>
</body>
</html>