fix HTML errors in 2012/omoikane/spoiler.html

2012/omoikane/spoiler.html

@@ -1,9 +1,9 @@
 <!DOCTYPE html>
-<html><head>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+<head>
+<meta charset="utf-8">
 <title>Replay text</title>
 <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
-<style type="text/css">
-.tmp{color:#00f}.final{color:#000}</style>
 </head><body>
 <noscript><span style="color:red">JavaScript required</span></noscript>
 <script type="text/javascript">