abstract：<!DOCTYPE html><html><head> <meta charset="utf-8"> <title>学习CSS第三节课 ——边框</title> <link rel="shortcut" type="image/x-icon" href=&quo
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>学习CSS第三节课 ——边框</title>
<link rel="shortcut" type="image/x-icon" href="image/favicon.ico">
<link rel="stylesheet" type="text/css" href="css/index.css">
<style type="text/css">
.box{width:100px; height: 100px; border: 1px solid #ccc;border-radius:50px;}
.main{width: 100px; height: 100px;border-top: 1px solid red;background:#ccc;border-left:1px solid red;}
.botton{border:none;}
.shadow{width:300px;height: 40px;box-shadow: 0px 6px 30px #ccc inset; /*border: 1px solid #ccc;*/}
</style>
</head>
<body>
<div class="box"></div><br>
<div class="main"></div>
<botton>登录</botton>
<div class="shadow"></div>
</body>
</html>