<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>圆角</title>
<style>
#box{
width: 100px;
height: 100px;
background-color:red;
margin: 100px auto;
/*border-radius 用来设置盒子的圆角的值可以是px 也可以是百分比 */
border-bottom-left-radius:50px;
border-top-left-radius: 50px;
}
</style>
</head>
<body>
<div id="box"></div>
</body>
</html>
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