CSS边框样式
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>CSS边框</title>
<style>
.box{width: 150px;height: 150px;background: violet; border: 2px dashed #ccc;border-radius: 75px}
.main{width: 150px;height: 150px;border-right: 1px dotted red;border-bottom: 1px double black;border-top: 1px solid red;background: #fff;border-left: 1px solid pink;}
button{border: 1px double burlywood;margin-top:10px }
.shadow{width:300px;height: 50px;box-shadow: 1px 5px 40px yellowgreen inset;margin-top: 10px;}
</style>
</head>
<body>
<div class="box"></div>
<div class="main"></div>
<button>登录</button>
<div class="shadow"></div>
</body>
</html>