圆角
DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>圆角title>
<style type="text/css">
.box{
width: 200px;
height: 200px;
background-color: #87CEEB;
/*
圆角
border-radius需要一个长度值，指定的是圆角的半径
*/
border-radius: 50px 20px;
}
style>
head>
<body>
<div class="box">div>
body>
html>