404 Not Found 精简美观
直接上代码：
<!DOCTYPE HTML>
<html>
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="robots" content="none" />
<title>404 Not Found</title>
<style>
*{font-family:"Microsoft Yahei";margin:0;font-weight:lighter;text-decoration:none;text-align:center;line-height:2.2em;}
html,body{height:100%;}
div{width:100%;text-align:center;margin-top:15%}
h1{font-size:100px;line-height:1em;}
</style>
</head>
<body>
<div>
<h1>404</h1>
<h3>大事不妙啦！</h3>
<p>很抱歉，您要访问的页面不存在！</p>
</div>
</body>
</html>效果图：
