照着写的css边框样式
<!DOCTYPE html>
<html>
<head>
<meta charset="utF-8">
<title></title>
<link rel="shortcut icon" type="image/x-icon" href="miages/favicom.ico">
<link rel="stylesheet" type="text/css" href="css/index.css">
<style type="text/css">
.box{width:120px;height:100px;border: 1px solid #ccc;border-radius:50px}
.main{width:100px;height:100px;border-top:1px solid rel;background:#ccc;border-left:1px solid red}
button{border:nonr;}
.shadow{width:300px; height:40px;box-shadow:10px 50px 3px #ccc;border:1px solid#ccc;}
</style>
</head>
<body>
<div class="box"></div>
<div class="main"></div>
<button>登入</button>
<div class-"shadow"></div>
</body>
</html>