代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>001淘宝官网实现圆角</title>
<link rel="stylesheet" href="../Css/001.css">
</head>
<body>
<div></div>
</body>
</html>
div{
width: 500px;
height: 36px;
border: 2px solid red;
border-top-left-radius: 20px;
border-bottom-left-radius: 20px;
}
运行结果：
