[27--CSS] 圆角边框
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>圆角边框</title>
<!--border-radius:属性设置圆角的幅度,如果标签元素宽和高十一样大的,拿设置50%则是一个圆-->
<style>
div{width:200px;
height: 200px;
border-width:5px;
border-style: solid;
border-color: yellow;
border-radius: 50%}
</style>
</head>
<body>
<div></div>
</body>
</html>