diff --git a/static/mathjax.css b/static/mathjax.css
index 4850e65..7cdb61d 100644
--- a/static/mathjax.css
+++ b/static/mathjax.css
@@ -48,7 +48,6 @@
 .mjx-chartest {display: block; visibility: hidden; position: absolute; top: 0; line-height: normal; font-size: 500%}
 .mjx-chartest .mjx-char {display: inline}
 .mjx-chartest .mjx-box {padding-top: 1000px}
-.MJXc-processing {visibility: hidden; position: fixed; width: 0; height: 0; overflow: hidden}
 .MJXc-processed {display: none}
 .mjx-test {display: block; font-style: normal; font-weight: normal; font-size: 100%; font-size-adjust: none; text-indent: 0; text-transform: none; letter-spacing: normal; word-spacing: normal; overflow: hidden; height: 1px}
 .mjx-ex-box-test {position: absolute; width: 1px; height: 60ex}
diff --git a/views/header.ejs b/views/header.ejs
index 010026c..2ca8ea7 100644
--- a/views/header.ejs
+++ b/views/header.ejs
@@ -7,7 +7,7 @@
     <title><%= title %> - <%= syzoj.config.title %></title>
     <link href="/libs/semantic-ui/semantic.min.css" rel="stylesheet">
     <link href="/tomorrow.css" rel="stylesheet">
-    <link href="/mathjax.css" rel="stylesheet">
+    <link href="/mathjax.css?20170713" rel="stylesheet">
     <link href="/libs/KaTeX/katex.min.css" rel="stylesheet">
     <link href="/libs/morris.js/morris.css" rel="stylesheet">
     <link href="/style.css?20170706" rel="stylesheet">