add 404 pages

404.md → 404.html

@@ -6,11 +6,11 @@ permalink: /404.html
 
 <script language="JavaScript"> function myrefresh(){window.location="/";}setTimeout('myrefresh()',5000);</script>
 
-## Error 404. Nothing was found :(   
+<h2> Error 404. Nothing was found :( </h2>
+<hr/>
+<p>This is not the correct link you are looking for.</p>
 
-This is not the correct link you are looking for.
+<p>Please go to [homepage](/) or contact us: paddle-dev@baidu.com</p>
 
-Please go to [homepage](/) or contact us: paddle-dev@baidu.com
-
-
-## The page will redirect to the homepage after 5 seconds.....
\ No newline at end of file
+<hr/>
+<h3>## The page will redirect to the homepage after 5 seconds.....</h3>